Bump actions/checkout from 6.0.2 to 7.0.0 in the all-github-actions group

.github/workflows/multi_version_tasks.yaml

@@ -31,7 +31,7 @@ jobs:
 
     steps:
       - name: Check out repository
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
         with:
           fetch-depth: 0
 

.github/workflows/release.yml

@@ -18,7 +18,7 @@ jobs:
     steps:
     # Checks out a copy of the repo.
     - name: Check out code
-      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+      uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
       with:
         fetch-depth: 0 # Fetch all history so the tool can get all the tags to determine version.
     # Set up the latest stable release of Dart and tooling.

.github/workflows/validate_repo.yaml

@@ -22,7 +22,7 @@ jobs:
 
     steps:
       - name: Check out repository
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
         with:
           fetch-depth: 0
 

.github/workflows/windows_unit_tests.yaml

@@ -21,7 +21,7 @@ jobs:
 
     steps:
       - name: Check out repository
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
         with:
           fetch-depth: 0