ci: upgrade workflows to Node 24 actions

[Deathcharge]

Summary\n- upgrade checkout to commit-pinned v7.0.1\n- upgrade setup-python to commit-pinned v7.0.0\n- remove the Node 20 deprecation warning from CI and release workflows\n\n## Verification\n- release-contract tests: 3 passed\n- zizmor 1.29.0 offline workflow audit: no findings\n- immutable action pin contract remains enforced\n\nThis follows the warning emitted by successful release dry run 31378343490.

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📥 Commits

Reviewing files that changed from the base of the PR and between 7ae4782 and 3e2e7c1.

📒 Files selected for processing (3)

• .github/workflows/ci.yml
• .github/workflows/release.yml
• CHANGELOG.md

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