Update actions/checkout action to v7

Author: renovate[bot]

.github/workflows/metrics.yaml

@@ -26,7 +26,7 @@ jobs:
       app_followup_svg: metrics/followup/app_followup.svg
     steps:
       - name: 📚 Git Checkout
-        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v4.0.0
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           submodules: recursive
           clean: true
@@ -73,7 +73,7 @@ jobs:
       projects_svg: metrics/projects/projects.svg
     steps:
       - name: 📚 Git Checkout
-        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v4.0.0
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           submodules: recursive
           clean: true