Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/1.10.yaml

@@ -37,7 +37,7 @@ jobs:
     steps:
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Determine Composer version from Dockerfile
         uses: ./.github/actions/determine-composer-version
@@ -108,7 +108,7 @@ jobs:
     steps:
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Prepare
         run: |

.github/workflows/2.2.yaml

@@ -37,7 +37,7 @@ jobs:
     steps:
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Determine Composer version from Dockerfile
         uses: ./.github/actions/determine-composer-version
@@ -108,7 +108,7 @@ jobs:
     steps:
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Prepare
         run: |

.github/workflows/latest.yaml

@@ -37,7 +37,7 @@ jobs:
     steps:
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Determine Composer version from Dockerfile
         uses: ./.github/actions/determine-composer-version
@@ -112,7 +112,7 @@ jobs:
     steps:
 
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Prepare
         run: |

.github/workflows/shellcheck.yaml

@@ -13,6 +13,6 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: ShellCheck
         run: find . -type f -name '*.sh' | grep -v generate-stackbrew-library | xargs shellcheck