Bump docker/build-push-action from 6 to 7 (#126)

Author: dependabot[bot]

action.yml

@@ -199,7 +199,7 @@ runs:
     - name: Build
       id: docker_build
       if: steps.preparation.outputs.build == 'true' && inputs.docker-username != '' && inputs.docker-password != ''
-      uses: docker/build-push-action@v6
+      uses: docker/build-push-action@v7
       with:
         context: ${{ inputs.working-directory }}
         push: ${{ inputs.docker-build-outputs == '' && steps.preparation.outputs.push || 'false' }}