Update actions/checkout action to v5

Author: renovate[bot]

.github/workflows/markdownlint.yaml

@@ -9,7 +9,7 @@ jobs:
   markdownlint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Run mdl
         uses: actionshub/markdownlint@main

.github/workflows/shellcheck.yaml

@@ -9,7 +9,7 @@ jobs:
   shellcheck:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Run ShellCheck
         uses: ludeeus/action-shellcheck@master

.github/workflows/yamllint.yaml

@@ -9,7 +9,7 @@ jobs:
   yamllint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v5
 
       - name: Run yamllint
         uses: bewuethr/yamllint-action@v1