Bump actions/checkout from 5 to 6 in the dependencies group (#195)

Bumps the dependencies group with 1 update: [actions/checkout](https://github.com/actions/checkout).


Updates `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
  dependency-group: dependencies
...

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/test.yml

@@ -23,10 +23,10 @@ jobs:
     container: swift:6.1-noble
     steps:
       - name: Check out sql-kit
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with: { path: sql-kit, repository: vapor/sql-kit }
       - name: Check out fluent-kit
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with: { path: fluent-kit, repository: vapor/fluent-kit }
       - name: Set up and run FluentKit tests
         run: |
@@ -69,15 +69,15 @@ jobs:
       MYSQL_HOSTNAME_B: mysql-b
     steps:
       - name: Check out sql-kit
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with: { path: sql-kit, repository: vapor/sql-kit }
       - name: Check out SQLKit driver
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           path: ${{ matrix.driver.sqlkit }}
           repository: vapor/${{ matrix.driver.sqlkit }}
       - name: Check out Fluent driver
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           path: ${{ matrix.driver.fluent }}
           repository: vapor/${{ matrix.driver.fluent }}