Bump actions/checkout from 5 to 6 (#212)

Bumps [actions/checkout](https://github.com/actions/checkout) from 5 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v5...v6)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/database_matrix.yml

@@ -47,7 +47,7 @@ jobs:
           sudo apt update -y
           sudo apt install -y libsqlite3-dev libpq-dev libmysqlclient-dev
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Configure MySQL authentication
         if: matrix.database == 'mysql'

.github/workflows/docs.yml

@@ -15,7 +15,7 @@ jobs:
       working_directory: 'docs/'
 
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Use Node.js ${{ matrix.node-version }}
       uses: actions/setup-node@v4
       with:

.github/workflows/lint.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Install deps
         run: |

.github/workflows/tests.yml

@@ -17,7 +17,7 @@ jobs:
           sudo apt update -y
           sudo apt install -y libsqlite3-dev
 
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - name: Set up Ruby ${{ matrix.ruby }}
         uses: ruby/setup-ruby@v1
         with: