Bump docker/build-push-action from 6.7.0 to 6.8.0

Bumps [docker/build-push-action](https://github.com/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@5cd11c3...32945a3)

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

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

.github/workflows/devcontainer-docker-image.yml

@@ -46,7 +46,7 @@ jobs:
 
     - name: Build and push Docker image
       id: docker_build
-      uses: docker/build-push-action@5cd11c3a4ced054e52742c5fd54dca954e0edd85
+      uses: docker/build-push-action@32945a339266b759abcbdc89316275140b0fc960
       with:
         context: .
         file: scripts/dev.Dockerfile

.github/workflows/docker-image.yml

@@ -34,7 +34,7 @@ jobs:
               type=semver,pattern={{major}}.{{minor}}
 
       - name: Build and load image
-        uses: docker/build-push-action@5cd11c3a4ced054e52742c5fd54dca954e0edd85
+        uses: docker/build-push-action@32945a339266b759abcbdc89316275140b0fc960
         with:
           context: .
           file: scripts/Dockerfile
@@ -46,7 +46,7 @@ jobs:
            docker run --rm ${{ env.CONTAINER_NAME }} conda run -n pymc-dev python -c 'import pymc;print(pymc.__version__)'
 
       - name: Build and push
-        uses: docker/build-push-action@5cd11c3a4ced054e52742c5fd54dca954e0edd85
+        uses: docker/build-push-action@32945a339266b759abcbdc89316275140b0fc960
         with:
           context: .
           push: true