chore(deps): update actions/checkout action to v6 (#284)

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

Author: renovate[bot]

.github/workflows/chart-lint.yml

@@ -31,7 +31,7 @@ jobs:
     env:
       TARGET_BRANCH: ${{ github.event.pull_request.base.ref || github.ref_name }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Set up Helm
@@ -52,7 +52,7 @@ jobs:
     env:
       README_GENERATOR_VERSION: 2.5.2
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Check README diff

.github/workflows/chart-test.yml

@@ -43,7 +43,7 @@ jobs:
       - name: Fail if safe-to-test label NOT applied
         if: ${{ github.event_name == 'pull_request' && !contains(github.event.pull_request.labels.*.name, 'safe-to-test') }}
         run: exit 1
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Set up Helm
@@ -76,7 +76,7 @@ jobs:
       - name: fail if safe-to-test label NOT applied
         if: ${{ github.event_name == 'pull_request' && !contains(github.event.pull_request.labels.*.name, 'safe-to-test') }}
         run: exit 1
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Set up Helm

.github/workflows/helm-release.yml

@@ -9,7 +9,7 @@ jobs:
       contents: write
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Configure Git

.github/workflows/push-oci.yml

@@ -21,7 +21,7 @@ jobs:
     runs-on: ubuntu-latest
     if: github.repository_owner == 'cryostatio'
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: Configure Git

.github/workflows/submodule.yml

@@ -19,7 +19,7 @@ jobs:
     if: ${{ github.repository_owner == 'cryostatio' }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           repository: cryostatio/cryostatio.github.io
           token: "${{ secrets.SUBMODULE_TOKEN }}"