Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/workflow.yml

@@ -25,7 +25,7 @@ jobs:
     runs-on: ubuntu-slim
     steps:
       - name: Checkout code
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
       - name: Install tools
         uses: asdf-vm/actions/install@b7bcd026f18772e44fe1026d729e1611cc435d47 # v4.0.1
       - name: Run ShellCheck
@@ -35,7 +35,7 @@ jobs:
     runs-on: ubuntu-slim
     steps:
       - name: Checkout code
-        uses: actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8 # v5.0.0
+        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
       - name: Install tools
         uses: asdf-vm/actions/install@b7bcd026f18772e44fe1026d729e1611cc435d47 # v4.0.1
       - name: Run shfmt