chore: 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/cd.yml

@@ -57,7 +57,7 @@ jobs:
           fi
       -
         name: Build Docker images
-        uses: docker/bake-action@v5
+        uses: docker/bake-action@v6
         with:
           # push and load may not be set together
           # must push manually in a next step

.github/workflows/ci.yml

@@ -44,7 +44,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
       -
         name: Build Docker images
-        uses: docker/bake-action@v5
+        uses: docker/bake-action@v6
         with:
           pull: true
           load: true
@@ -143,7 +143,7 @@ jobs:
         run: echo "AUTH_SECRET=$(openssl rand -hex 32)" >> $GITHUB_ENV
       -
         name: Build Docker Images
-        uses: docker/bake-action@v5
+        uses: docker/bake-action@v6
         with:
           pull: true
           load: true