Update actions/checkout action to v7

Author: renovate[bot]

.github/workflows/changelog.yml

@@ -12,7 +12,7 @@ jobs:
     timeout-minutes: 4
     if: "!contains(github.event.head_commit.message, 'update changelog')"
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:

.github/workflows/super-linter.yml

@@ -40,7 +40,7 @@ jobs:
       # Checkout the code base #
       ##########################
       - name: Checkout Code
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
         with:
           # Super-Linter requires full repository history for analysis
           fetch-depth: 0