Bump docker/bake-action from 5 to 6

Bumps [docker/bake-action](https://github.com/docker/bake-action) from 5 to 6.
- [Release notes](https://github.com/docker/bake-action/releases)
- [Commits](docker/bake-action@v5...v6)

---
updated-dependencies:
- dependency-name: docker/bake-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/build.yml

@@ -130,7 +130,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
       -
         name: Build artifacts
-        uses: docker/bake-action@v5
+        uses: docker/bake-action@v6
         with:
           targets: artifact-all
           pull: true
@@ -152,7 +152,7 @@ jobs:
           if-no-files-found: error
       -
         name: Build image
-        uses: docker/bake-action@v5
+        uses: docker/bake-action@v6
         with:
           files: |
             ./docker-bake.hcl
@@ -163,7 +163,7 @@ jobs:
           ALPINE_VERSION: ${{ matrix.alpine_version }}
       -
         name: Build dist
-        uses: docker/bake-action@v5
+        uses: docker/bake-action@v6
         with:
           files: |
             ./docker-bake.hcl