Warnings in tests

В результатах тестов есть warning'и. Локально и в CI.
https://github.com/suvorovrain/formal-lang-course/actions/runs/17525068924/job/49774366251#step:5:3237

```
=============================== warnings summary ===============================
tests/test_task1.py::test_get_graph_info
/opt/hostedtoolcache/setup-rye-2024-03-04/0.44.0/x86_64/py/cpython@3.12.5/lib/python3.12/shutil.py:1272: DeprecationWarning: Python 3.14 will, by default, filter extracted tar archives and reject files or modify their metadata. Use the filter argument to control this behavior.
tarobj.extractall(extract_dir, filter=filter)

tests/test_task1.py::test_save_two_cycles_graph
/home/runner/work/formal-lang-course/formal-lang-course/project/graph_utils.py:26: DeprecationWarning: nx.nx_pydot.to_pydot depends on the pydot package, which has known issues and is not actively maintained.

See https://github.com/networkx/networkx/issues/5723
dot_graph = to_pydot(graph)

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
================= 4 passed, 2973 skipped, 2 warnings in 4.85s ==================
Configure python path: /home/runner/work/formal-lang-course/formal-lang-course
```

Start by running the test suite and reviewing the warning output linked from CI, especially tests/test_task1.py and project/graph_utils.py. Determine the source of both DeprecationWarnings and verify the suite completes without these warnings in local and CI runs.

Written by the indexing model from the issue text.