Pin (and upgrade) immutable-eligible action actions/checkout to their semantic versions

Author: mrecachinas

.github/workflows/major-version-updater.yml

@@ -15,7 +15,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout Repo
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@4.2.2
 
       - name: version
         id: version