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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -6,7 +6,7 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
       - name: Stylua
@@ -21,7 +21,7 @@ jobs:
     name: pandoc to vimdoc
     if: ${{ github.ref == 'refs/heads/main' }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
       - name: panvimdoc
@@ -42,7 +42,7 @@ jobs:
     permissions:
       contents: write
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
       - uses: rhysd/action-setup-vim@v1

.github/workflows/release.yml

@@ -23,7 +23,7 @@ jobs:
           release-type: simple
           package-name: hurl.nvim
           token: ${{ secrets.GITHUB_TOKEN }}
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
       - name: tag stable versions