chore(ci): bump actions/checkout from 3.6.0 to 4 (#22)

* chore(ci): bump actions/checkout from 3.6.0 to 4.0.0

Bumps [actions/checkout](https://github.com/actions/checkout) from 3.6.0 to 4.0.0.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v3.6.0...v4.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

* Apply suggestions from code review

---------

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Tim te Beek <[email protected]>

.github/workflows/ci.yml

@@ -28,7 +28,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3.6.0
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: actions/setup-java@v3

.github/workflows/integration-tests.yml

@@ -20,11 +20,11 @@ jobs:
     name: itest-${{ matrix.java }}
     steps:
       - name: checkout-openrewrite/spring-petclinic-migration
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4
         with:
           repository: openrewrite/spring-petclinic-migration
       - name: setup-plugin-checkout-source
-        uses: actions/checkout@v3.6.0
+        uses: actions/checkout@v4
         with:
           path: rewrite-gradle-plugin
       - name: setup-plugin-setup-java-11

.github/workflows/publish.yml

@@ -16,7 +16,7 @@ jobs:
   release:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3.6.0
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - uses: actions/setup-java@v3