chore(deps): update actions/checkout action to v6 (#243)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/image-build-and-publish-push.yaml

@@ -16,7 +16,7 @@ jobs:
     outputs:
       apps: ${{ steps.filter.outputs.changes }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: dorny/paths-filter@v3
@@ -45,7 +45,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: "[prind] checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           persist-credentials: false
       - name: "[prind] set up build environment"

.github/workflows/image-build-and-publish-schedule.yaml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: "[prind] checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           persist-credentials: false
       - name: "[prind] set up build environment"

.github/workflows/image-build-review.yaml

@@ -15,7 +15,7 @@ jobs:
     outputs:
       apps: ${{ steps.filter.outputs.changes }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: dorny/paths-filter@v3
@@ -57,7 +57,7 @@ jobs:
     runs-on: ubuntu-24.04
     steps:
       - name: "[prind] checkout"
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           persist-credentials: false
       - name: "[prind] set up build environment"

.github/workflows/image-docs-publish.yaml

@@ -16,7 +16,7 @@ jobs:
     outputs:
       apps: ${{ steps.filter.outputs.changes }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - uses: dorny/paths-filter@v3
@@ -43,7 +43,7 @@ jobs:
         app: ${{ fromJSON(needs.changes.outputs.apps) }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - name: "Update Docker Hub Description"

.github/workflows/pr-yamllint.yaml

@@ -6,7 +6,7 @@ jobs:
   yamllint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
       - name: Run yamllint