[Bug-Candidate]: ParsingError: Missing function Variable not found:

### Describe the issue:

Slither breaks due to a parsing error for Uniswap's UniversalRouter.
Contract address: [0x66a9893cc07d91d95644aedd05d03f95e1dba8af](https://etherscan.io/address/0x66a9893cc07d91d95644aedd05d03f95e1dba8af)
GitHub repository: https://github.com/Uniswap/universal-router

### Code example to reproduce the issue:

Slither gets stuck until forced interruption.
The same happens when running slither in this contract's hardhat/foundry [project](https://github.com/Uniswap/universal-router) folder.
```
slither 0x66a9893cc07d91d95644aedd05d03f95e1dba8af --etherscan-apikey
ERROR:ContractSolcParsing:Missing function Variable not found: _getLocker() (context Dispatcher src/pkgs/universal-router/contracts/base/Dispatcher.sol#22-300 (1 - 2))
ERROR:ContractSolcParsing:Missing params 'unlock()' src/pkgs/universal-router/contracts/UniversalRouter.sol#14-67 (1 - 2)
```

cryptic-compile seems to run without issues:
```
crytic-compile
INFO:CryticCompile:'forge clean' running (wd: /home/universal-router)
INFO:CryticCompile:'forge config --json' running
INFO:CryticCompile:'forge build --build-info --skip */test/** */script/** --force' running (wd: /home/universal-router)
```

### Version:

0.11.3

### Relevant log output:

```shell
Traceback (most recent call last):
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/solc_parsing/declarations/contract.py", line 443, in analyze_content_functions
function_parser.analyze_content()
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/solc_parsing/declarations/function.py", line 340, in analyze_content
node_parser.analyze_expressions(self)
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/solc_parsing/cfg/node.py", line 37, in analyze_expressions
expression = parse_expression(self._unparsed_expression, caller_context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/solc_parsing/expressions/expression_parsing.py", line 345, in parse_expression
return parse_call(expression, caller_context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/solc_parsing/expressions/expression_parsing.py", line 154, in parse_call
called = parse_expression(expression["expression"], caller_context)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/solc_parsing/expressions/expression_parsing.py", line 512, in parse_expression
var, was_created = find_variable(value, caller_context, referenced_declaration)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/solc_parsing/expressions/find_variable.py", line 509, in find_variable
raise VariableNotFound(
slither.solc_parsing.exceptions.VariableNotFound: Variable not found: _getLocker() (context Dispatcher src/pkgs/universal-router/contracts/base/Dispatcher.sol#22-300 (1 - 2))

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/__main__.py", line 882, in main_impl
) = process_all(filename, args, detector_classes, printer_classes)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/__main__.py", line 107, in process_all
) = process_single(compilation, args, detector_classes, printer_classes)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/__main__.py", line 80, in process_single
slither = Slither(target, ast_format=ast, **vars(args))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/slither.py", line 202, in __init__
self._init_parsing_and_analyses(kwargs.get("skip_analyze", False))
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/slither.py", line 211, in _init_parsing_and_analyses
raise e
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/slither.py", line 207, in _init_parsing_and_analyses
parser.parse_contracts()
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/solc_parsing/slither_compilation_unit_solc.py", line 583, in parse_contracts
self._analyze_third_part(contracts_to_be_analyzed, libraries)
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/solc_parsing/slither_compilation_unit_solc.py", line 694, in _analyze_third_part
self._analyze_variables_modifiers_functions(contract)
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/solc_parsing/slither_compilation_unit_solc.py", line 801, in _analyze_variables_modifiers_functions
contract.analyze_content_functions()
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/solc_parsing/declarations/contract.py", line 445, in analyze_content_functions
self.log_incorrect_parsing(f"Missing function {e}")
File "/home/mokita/.cache/pypoetry/virtualenvs/admin-check-iU3Dt9fh-py3.12/lib/python3.12/site-packages/slither/solc_parsing/declarations/contract.py", line 429, in log_incorrect_parsing
raise ParsingError(error)
slither.solc_parsing.exceptions.ParsingError: Missing function Variable not found: _getLocker() (context Dispatcher src/pkgs/universal-router/contracts/base/Dispatcher.sol#22-300 (1 - 2))
ERROR:root:Error:
ERROR:root:Missing function Variable not found: _getLocker() (context Dispatcher src/pkgs/universal-router/contracts/base/Dispatcher.sol#22-300 (1 - 2))
ERROR:root:Please report an issue to https://github.com/crytic/slither/issues
```