Update actions/checkout action to v7 (#45)

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

Author: renovate[bot]

.github/workflows/main.yaml

@@ -25,7 +25,7 @@ jobs:
     steps:
       # Versions
       - run: docker --version
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
 
       - uses: camptocamp/initialise-gopass-summon-action@v2
         with:

.github/workflows/rebuild.yaml

@@ -21,7 +21,7 @@ jobs:
           - v3.0.0
 
     steps:
-      - uses: actions/checkout@v6
+      - uses: actions/checkout@v7
         with:
           ref: ${{matrix.branch}}