chore(no-ticket): bump pyupgrade to v3.21.2 and apply fixes

[BartoszBlizniak]

Bumps pyupgrade pre-commit hook from v3.19.1 to v3.21.2 and adds the --py310-plus arg so the rewrite targets the project's minimum supported Python. Applies the resulting reformat across the tree.

No behavior change — every diff in this PR is what pre-commit run -a pyupgrade produces on top of the version bump.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update
• Refactoring
• Other (please describe): chore / tooling upgrade

Additional Notes

What changed

• .pre-commit-config.yaml — pyupgrade rev v3.19.1 → v3.21.2, add args: [--py310-plus], fix indentation of the hook block.
• 9 source files reformatted by the upgraded hook (modernised string formatting, Optional[X] → X | None, etc.):
  • .github/.platforms/generate_platforms.py
  • cloudsmith_cli/cli/commands/mcp.py
  • cloudsmith_cli/cli/saml.py
  • cloudsmith_cli/core/api/init.py
  • cloudsmith_cli/core/api/metadata.py
  • cloudsmith_cli/core/download.py
  • cloudsmith_cli/core/mcp/data.py
  • cloudsmith_cli/core/mcp/server.py
  • cloudsmith_cli/core/pagination.py

Verification

• pre-commit run -a clean.
• pytest green.

[Copilot]

Pull request overview

• Updates the repo’s pre-commit pyupgrade hook to target the project’s minimum supported Python (3.10+) and applies the resulting automated rewrites across the codebase.

Changes:

• Bump pyupgrade from v3.19.1 to v3.21.2 and add --py310-plus in .pre-commit-config.yaml.
• Apply pyupgrade-driven modernizations (PEP 604 unions, built-in generics, f-strings, collections.abc imports) across the touched Python modules.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
.pre-commit-config.yaml	Bumps pyupgrade and configures --py310-plus for Python 3.10+ rewrites.
.github/.platforms/generate_platforms.py	Updates typing imports to collections.abc where applicable.
cloudsmith_cli/cli/commands/mcp.py	Switches type hints to built-in generics (dict, list) in MCP CLI output helpers.
cloudsmith_cli/cli/saml.py	Replaces some .format(...) usage with f-strings.
cloudsmith_cli/core/api/init.py	Modernizes typing from Type[T] to type[T].
cloudsmith_cli/core/api/metadata.py	Rewrites Optional/Union annotations to PEP 604 unions.
cloudsmith_cli/core/download.py	Modernizes typing annotations to PEP 604 unions and built-in generics.
cloudsmith_cli/core/mcp/data.py	Updates OpenAPI tool dataclass annotations to built-in generics and PEP 604 unions.
cloudsmith_cli/core/mcp/server.py	Updates schema/tool typing to built-in generics and PEP 604 unions.
cloudsmith_cli/core/pagination.py	Updates pagination typing to built-in generics and collections.abc.

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