Bump actions/checkout from 6.0.3 to 7.0.0 (#312)

Author: frequenz-auto-dependabot[bot]

.github/workflows/ci-pr.yaml

@@ -34,7 +34,7 @@ jobs:
         uses: frequenz-floss/gh-action-setup-git@f9d86a01228ee1cadaac5224d4d7626f1eb23f90 # v1.0.0
 
       - name: Fetch sources
-        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           submodules: true
 

.github/workflows/ci.yaml

@@ -83,7 +83,7 @@ jobs:
         uses: frequenz-floss/gh-action-setup-git@f9d86a01228ee1cadaac5224d4d7626f1eb23f90 # v1.0.0
 
       - name: Fetch sources
-        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           submodules: true
 
@@ -181,7 +181,7 @@ jobs:
         uses: frequenz-floss/gh-action-setup-git@f9d86a01228ee1cadaac5224d4d7626f1eb23f90 # v1.0.0
 
       - name: Fetch sources
-        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           submodules: true
 
@@ -221,7 +221,7 @@ jobs:
         uses: frequenz-floss/gh-action-setup-git@f9d86a01228ee1cadaac5224d4d7626f1eb23f90 # v1.0.0
 
       - name: Fetch sources
-        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           submodules: true