fix: pin GitHub Actions to immutable SHA hashes to prevent supply chain attacks (#1088)

* chore: publish from staged

* fix: pin GitHub Actions to immutable SHA hashes to prevent supply chain attacks

Co-authored-by: simonkurtz-MSFT <84809797+simonkurtz-MSFT@users.noreply.github.com>

* chore: publish from staged

* Clean plugins

* Clean plugins

* Clean plugins

* Fix gem-team plugin

* Reset README.plugins.md

---------

Co-authored-by: github-actions[bot] <41898282+github-actions[bot]@users.noreply.github.com>
Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

.github/workflows/check-pr-target.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Reject PR targeting main
-        uses: actions/github-script@v7
+        uses: actions/github-script@f28e40c7f34bde8b3046d885e986cb6290c5673b # v7.1.0
         with:
           script: |
             const body = [