Update actions/checkout action to v7.0.1 (#82)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -11,7 +11,7 @@ jobs:
       py_version: ${{ steps.python_version.outputs.py_version }}
       cp_tag: ${{ steps.python_version.outputs.cp_tag }}
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
         with:
           fetch-depth: 0
       - name: Fetch Python version from docker-borgmatic Dockerfile
@@ -68,7 +68,7 @@ jobs:
     env:
       CIBW_BUILD: '${{ needs.setup.outputs.cp_tag }}-musllinux_*'
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v4
         with:

.github/workflows/sync-recipes.yml

@@ -15,7 +15,7 @@ jobs:
       pull-requests: write
 
     steps:
-      - uses: actions/checkout@v7
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
 
       - name: Parse requirements.txt and sync recipes
         id: sync