Fix some RUF012 per file ignores

[MaximSmolskiy]

Describe your change:

Fix some RUF012 per file ignores

• Add an algorithm?
• Fix a bug or typo in an existing algorithm?
• Add or change doctests? -- Note: Please avoid changing both code and tests in a single pull request.
• Documentation change?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doctests that pass the automated testing.
• All new algorithms include at least one URL that points to Wikipedia or another similar explanation.
• If this pull request resolves one or more open issues then the description above includes the issue number(s) with a closing keyword: "Fixes #ISSUE-NUMBER".

[MaximSmolskiy]

mypy.....................................................................Failed
- hook id: mypy
- exit code: 1

other/lru_cache.py:213: error: ClassVar cannot contain type variables  [misc]
other/lfu_cache.py:200: error: ClassVar cannot contain type variables  [misc]
Found 2 errors in 2 files (checked 1310 source files)

[cclauss]

I think this could be nasty... If you use this variable twice decorator_function_to_instance_map will be {} on the first call but will NOT be {} on the second call. https://docs.python-guide.org/writing/gotchas/#mutable-default-arguments