.github: Bump actions/checkout from 6.0.2 to 7.0.0

.github/workflows/markdownlint.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
 
       - name: Run markdownlint
         uses: DavidAnson/markdownlint-cli2-action@ded1f9488f68a970bc66ea5619e13e9b52e601cd

.github/workflows/shellcheck.yml

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: Checkout
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
 
       - name: Run shellcheck
         uses: ludeeus/action-shellcheck@00cae500b08a931fb5698e11e79bfbd38e612a38

.github/workflows/test-runner.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: Checkout code
-        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
       - run: docker pull exercism/zig-test-runner
       - name: Run tests for all exercises
         run: sh ./bin/test

.github/workflows/tests.yml

@@ -14,7 +14,7 @@ jobs:
     name: Check exercises (${{ matrix.os }})
     runs-on: ${{ matrix.os }}
     steps:
-    - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+    - uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
 
     - name: Install Zig
       uses: mlugg/setup-zig@d1434d08867e3ee9daa34448df10607b98908d29

.github/workflows/zig-fmt.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
     - name: Checkout
-      uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd
+      uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0
 
     - name: Install Zig
       uses: mlugg/setup-zig@d1434d08867e3ee9daa34448df10607b98908d29