Bump docker/build-push-action from 2.7.0 to 2.9.0 (#103)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2.7.0 to 2.9.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v2.7.0...v2.9.0)

---
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>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/build_latest.yml

@@ -37,7 +37,7 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Build and push latest Debian image
-        uses: docker/build-push-action@v2.7.0
+        uses: docker/build-push-action@v2.9.0
         with:
           context: ./src
           file: ./src/Dockerfile
@@ -71,7 +71,7 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Build and push latest Alpine image
-        uses: docker/build-push-action@v2.7.0
+        uses: docker/build-push-action@v2.9.0
         with:
           context: ./src
           file: ./src/Dockerfile-alpine

.github/workflows/build_tags.yml

@@ -32,7 +32,7 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Build and push all Debian images
-        uses: docker/build-push-action@v2.7.0
+        uses: docker/build-push-action@v2.9.0
         with:
           context: ./src
           file: ./src/Dockerfile
@@ -75,7 +75,7 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Build and push all Alpine images
-        uses: docker/build-push-action@v2.7.0
+        uses: docker/build-push-action@v2.9.0
         with:
           context: ./src
           file: ./src/Dockerfile-alpine