pin down checkout version for workflow (#1116)

Author: angeloskyratzakos

.github/workflows/claude.yml

@@ -25,12 +25,12 @@ jobs:
       id-token: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
         with:
           fetch-depth: 1
 
       - name: Run Claude Code
         id: claude
         uses: anthropics/claude-code-action@beta
         with:
-          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}