feat(security): improve GHA security

[jfagoagas]

Description

Improve GHA security also adding zizmor pre-commit and workflow.

License

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

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[Copilot]

Pull request overview

This PR improves GitHub Actions security posture by adding zizmor-based workflow scanning and tightening authentication/permissions in existing CI and release workflows.

Changes:

• Add zizmor as a pre-commit hook to locally scan GitHub Actions workflows.
• Introduce a dedicated zizmor GitHub Actions workflow for workflow security analysis.
• Harden existing workflows by disabling persisted checkout credentials and switching PyPI publishing to OIDC via pypa/gh-action-pypi-publish.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
.pre-commit-config.yaml	Adds a zizmor pre-commit hook for local GitHub Actions workflow security scanning.
.github/workflows/zizmor.yml	New workflow to run zizmor against workflow files with restricted permissions.
.github/workflows/pypi-release.yml	Hardens release job permissions and switches PyPI publish to OIDC-based action.
.github/workflows/pull-request.yml	Disables persisted checkout credentials to reduce token exposure risk.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.02%. Comparing base (90dfbe6) to head (f49bd59).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #270   +/-   ##
=======================================
  Coverage   97.02%   97.02%           
=======================================
  Files          64       64           
  Lines        1043     1043           
=======================================
  Hits         1012     1012           
  Misses         31       31           

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