Bump minimum required Python version to 3.12

[iMicknl]

No description provided.

[Copilot]

Pull request overview

This PR bumps the minimum required Python version from 3.10 to 3.12, removing support for Python 3.10 and 3.11. The key changes include:

• Updated requires-python constraint from >=3.10 to >=3.12 in pyproject.toml
• Removed backports-strenum dependency (StrEnum is native in Python 3.11+)
• Replaced conditional StrEnum imports with direct imports from the standard library enum module across all enum files

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Updated minimum Python version to 3.12 and removed backports-strenum dependency
uv.lock	Removed Python 3.10/3.11 wheels and conditional dependencies (async-timeout, backports-strenum, backports-asyncio-runner, exceptiongroup, tomli)
pyoverkiz/enums/*.py	Removed sys.version_info conditionals and simplified imports to use StrEnum directly from enum module (8 files)

Note: The changes are well-executed and consistent across all files. However, the GitHub Actions workflows (.github/workflows/test.yml and .github/workflows/lint.yaml) still include Python 3.10 and 3.11 in their test matrices, which should be updated in a follow-up commit to align with this version bump. Since those files are not part of this PR diff, I cannot comment on them directly.

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