chore(deps): update docker/build-push-action action to v7 (#80)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/test.yml

@@ -25,7 +25,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
       - name: Tests of actinia-module-plugin
         id: docker_build
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           push: false
           tags: actinia-module-plugin-test:alpine