chore: replace deprecated typing aliases

[gruebel]

This PR

• also added 2 ruff rules to make sure those aliases won't be imported again

[gemini-code-assist]

Summary of Changes

Hello @gruebel, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on enhancing the codebase's type hinting consistency and maintainability. It systematically replaces older, deprecated typing aliases with their modern collections.abc equivalents across various files. To ensure adherence to these new standards, two new Ruff linting rules have been integrated, which will help prevent the reintroduction of these deprecated aliases in the future. These changes contribute to a more robust and future-proof type-checking environment.

Highlights

• Type Hint Modernization: Replaced deprecated typing aliases (such as typing.Mapping, typing.Callable, typing.Sequence, typing.Optional, typing.Union, and typing.TYPE_CHECKING) with their more explicit collections.abc counterparts or direct typing module access where appropriate across the codebase.
• Ruff Rule Enforcement: Introduced two new Ruff rules (ICN003 and TID251) in pyproject.toml to prevent future use of these deprecated typing aliases and enforce the use of collections.abc for common abstract base classes, ensuring consistent type-hinting practices.
• Minor Code Refinements: Included small improvements such as using .copy() for list duplication instead of slicing [:] and employing the in operator for string containment checks, enhancing code clarity and Pythonic style.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.86%. Comparing base (de37144) to head (ea717f2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #537   +/-   ##
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  Coverage   97.86%   97.86%           
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  Files          39       39           
  Lines        1823     1823           
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  Hits         1784     1784           
  Misses         39       39           

Flag	Coverage Δ
unittests	97.86% <100.00%> (ø)

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[gemini-code-assist]

Code Review

This pull request replaces deprecated typing aliases with their collections.abc counterparts, which is a great improvement for future Python compatibility. The addition of ruff rules to enforce this is also a good step towards maintaining code quality.

My review includes a few suggestions:

• In openfeature/event.py, I've pointed out some redundant field definitions in a dataclass that can be simplified.
• In pyproject.toml, I've found a couple of issues with the new ruff configuration that would prevent the new linting rules from working as intended.

The rest of the changes look good and are applied consistently across the codebase.