Bump docker/build-push-action from 5 to 6

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

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

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

.github/workflows/github-actions.yaml

@@ -13,20 +13,20 @@ jobs:
       - uses: actions/checkout@v4
 
       - name: Build minimal-toolchain:${{ matrix.toolchain }}
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           file: Dockerfile-${{ matrix.toolchain }}-minimal
           tags: minimal-toolchain:${{ matrix.toolchain }}
 
       - name: Build add-netcdf:${{ matrix.toolchain }}
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           file: Dockerfile-add-netcdf
           build-args: TOOLCHAIN=${{ matrix.toolchain }}
           tags: add-netcdf:${{ matrix.toolchain }}
 
       - name: Build add-python:${{ matrix.toolchain }}
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           file: Dockerfile-add-python
           build-args: TOOLCHAIN=${{ matrix.toolchain }}
@@ -48,7 +48,7 @@ jobs:
           password: ${{ secrets.GITHUB_TOKEN }}
 
       - name: Build and push rte-rrtmgp-ci:${{ matrix.toolchain }}
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           file: Dockerfile-finalize
           build-args: TOOLCHAIN=${{ matrix.toolchain }}