chore(build): guard gitleaks license and pin action SHA

Author: sklarsa

.github/workflows/gitleaks.yml

@@ -17,7 +17,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
-      - uses: gitleaks/gitleaks-action@ff98106e4c7b2bc287b24eaf42907196329070c7 # v2.3.9
-        if: ${{ env.GITLEAKS_LICENSE != '' }}
+      - uses: gitleaks/gitleaks-action@83d9cd684c87d95d656c1458ef04895a7f1cbd8e
+        if: ${{ secrets.GITLEAKS_LICENSE != '' }}
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}