Bump docker/build-push-action from 2 to 2.4.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2 to 2.4.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](https://github.com/docker/build-push-action/compare/v2...v2.4.0)

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

.github/workflows/update-base-image.yml

@@ -33,7 +33,7 @@ jobs:
       -
         name: Build and push to Docker Hub and Github Packages Docker Registry
         id: docker_build
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v2.4.0
         with:
           push: true
           tags: |

.github/workflows/update-image-on-push.yml

@@ -34,7 +34,7 @@ jobs:
       -
         name: Build and push to Docker Hub and Github Packages Docker Registry
         id: docker_build
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v2.4.0
         with:
           push: true
           tags: |