build(deps): bump the updates group with 2 updates

Bumps the updates group with 2 updates: [actions/checkout](https://github.com/actions/checkout) and [docker/build-push-action](https://github.com/docker/build-push-action).


Updates `actions/checkout` from 4.1.7 to 4.2.0
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](actions/checkout@v4.1.7...v4.2.0)

Updates `docker/build-push-action` from 6.7.0 to 6.8.0
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v6.7.0...v6.8.0)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: updates
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: updates
...

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

.github/workflows/build.yml

@@ -41,7 +41,7 @@ jobs:
       DOCKER_HUB_ORG: itzg
       MAIN_VARIANT: java21
     steps:
-      - uses: actions/checkout@v4.1.7
+      - uses: actions/checkout@v4.2.0
 
       - name: Docker meta
         id: meta
@@ -92,7 +92,7 @@ jobs:
 
       - name: Build and push
         id: docker_build
-        uses: docker/build-push-action@v6.7.0
+        uses: docker/build-push-action@v6.8.0
         with:
           platforms: ${{ matrix.platforms }}
           # ensure latest base image is used

.github/workflows/test.yml

@@ -20,7 +20,7 @@ jobs:
             platforms: linux/amd64,linux/arm64
             tagPrefix: java21-
     steps:
-      - uses: actions/checkout@v4.1.7
+      - uses: actions/checkout@v4.2.0
 
       - name: Setup Docker Buildx
         uses: docker/[email protected]
@@ -30,7 +30,7 @@ jobs:
 
       - name: Build
         id: docker_build
-        uses: docker/build-push-action@v6.7.0
+        uses: docker/build-push-action@v6.8.0
         with:
           platforms: ${{ matrix.platforms }}
           # ensure latest base image is used