chore(otterdog): pinning workflows due to blueprint pin-github-actions

[eclipse-otterdog]

This PR has been automatically created by Otterdog due to blueprint: Pin GitHub Actions to commit SHAs.

Supply-chain hardening: every used action / reusable workflow gets pinned to a full commit SHA (with a version comment). Opt-out per line via "# ignore: pin". Note: the "uses: osgi/.github/..." references from the require-ci-workflows blueprint stay on @main deliberately — pinning them would defeat the central-update mechanism; mark them with "# ignore: pin" if this blueprint proposes pinning there.

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