Update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/release.yaml

@@ -8,7 +8,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: "0"
       - name: Build changelog from PRs with labels

.github/workflows/test.yaml

@@ -14,19 +14,19 @@ jobs:
           - lint_yaml
           - lint_adoc
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Run ${{ matrix.command }}
         run: make ${{ matrix.command }}
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - name: Run tests
         run: make test
   editorconfig:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
       - uses: snow-actions/[email protected]
         with:
           args: 'check'