Bump actions/checkout from 3 to 6 (#1398)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3...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/check_dependents.yml

@@ -26,10 +26,10 @@ jobs:
           otp-version: "27"
 
       - name: Checkout absinthe
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Checkout ${{ matrix.dependent }}
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           repository: "absinthe-graphql/${{ matrix.dependent }}"
           path: "${{ matrix.dependent }}"

.github/workflows/ci.yml

@@ -40,7 +40,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Set up Elixir
         uses: erlef/setup-beam@v1

.github/workflows/publish.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Check out
-        uses: actions/checkout@v3
+        uses: actions/checkout@v6
         with:
           ref: ${{ inputs.tag || github.ref }}