Migration to Python3? SafeConfigParser

**Environment**
- How did you install GRR? [e.g. from release DEB, HEAD DEB, PIP package, source]
Docker Compose
- What GRR version are you running?
Latest
- What operating system does the GRR server run on? [e.g. Ubuntu 18.04]
Docker on Mac OS 15.4.1
- What operating system does the affected GRR client run on, if applicable? [e.g. Windows 10]
Mac OS 15.4.1

**Describe the issue**
It seems like the script is utilizing antiquated python such as SafeConfigParser - can we make sure the 2to3 futures library is included so it doesnt break in later python3 enviornments?

Ran the command:
`CFLAGS=-stdlib=libc++ pip install grr-response-client-builder`

**Error logs**
```
ollecting grr-response-client-builder
Using cached grr-response-client-builder-3.4.2.post4.zip (49 kB)
Installing build dependencies ... done
Getting requirements to build wheel ... error
error: subprocess-exited-with-error

× Getting requirements to build wheel did not run successfully.
│ exit code: 1
╰─> [24 lines of output]
Traceback (most recent call last):
File "/Users/justinb/grr/grr/grr/client_builder/venv/lib/python3.13/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 389, in
main()
~~~~^^
File "/Users/justinb/grr/grr/grr/client_builder/venv/lib/python3.13/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 373, in main
json_out["return_val"] = hook(**hook_input["kwargs"])
~~~~^^^^^^^^^^^^^^^^^^^^^^^^
File "/Users/justinb/grr/grr/grr/client_builder/venv/lib/python3.13/site-packages/pip/_vendor/pyproject_hooks/_in_process/_in_process.py", line 143, in get_requires_for_build_wheel
return hook(config_settings)
File "/private/var/folders/nr/hpqy5wdj1pd1ksvhs5x20dvw0000gn/T/pip-build-env-bigcx154/overlay/lib/python3.13/site-packages/setuptools/build_meta.py", line 331, in get_requires_for_build_wheel
return self._get_build_requires(config_settings, requirements=[])
~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/private/var/folders/nr/hpqy5wdj1pd1ksvhs5x20dvw0000gn/T/pip-build-env-bigcx154/overlay/lib/python3.13/site-packages/setuptools/build_meta.py", line 301, in _get_build_requires
self.run_setup()
~~~~~~~~~~~~~~^^
File "/private/var/folders/nr/hpqy5wdj1pd1ksvhs5x20dvw0000gn/T/pip-build-env-bigcx154/overlay/lib/python3.13/site-packages/setuptools/build_meta.py", line 512, in run_setup
super().run_setup(setup_script=setup_script)
~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/private/var/folders/nr/hpqy5wdj1pd1ksvhs5x20dvw0000gn/T/pip-build-env-bigcx154/overlay/lib/python3.13/site-packages/setuptools/build_meta.py", line 317, in run_setup
exec(code, locals())
~~~~^^^^^^^^^^^^^^^^
File "", line 32, in
File "", line 27, in get_config
AttributeError: module 'configparser' has no attribute 'SafeConfigParser'. Did you mean: 'RawConfigParser'?
[end of output]

note: This error originates from a subprocess, and is likely not a problem with pip.
error: subprocess-exited-with-error
```

**Additional context**
Was working on this as the mac osx client doesnt seem to work on Apple Sillicon?