Bump docker/build-push-action from v1.1.0 to v2 (#7245)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from v1.1.0 to v2.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Changelog](85d408708d/CHANGELOG.md)
- [Commits](https://github.com/docker/build-push-action/compare/v1.1.0...85d408708d8c09e8991e7b18899e77d7aee89287)

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

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

.github/workflows/docker.yml

@@ -16,7 +16,7 @@ jobs:
         id: date
         run: echo "::set-output name=date::$(date +'%Y-%m-%d')"
       - name: Publish to Docker Hub
-        uses: docker/build-push-action@v1.1.0
+        uses: docker/build-push-action@v2
         with:
           repository: interchainio/simapp
           username: ${{ secrets.DOCKER_USERNAME }}