Update actions/checkout action to v2.7.0

.github/workflows/release-notes.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout the requested branch
-        uses: actions/checkout@5a4ac9002d0be2fb38bd78e4b4dbde5606d7042f # v2.3.4
+        uses: actions/checkout@ee0669bd1cc54295c223e0bb666b733df41de1c5 # v2.7.0
       - name: Fetch all tags and branches
         run: git fetch --prune --unshallow
       - name: Cache Tools