Bump docker/setup-buildx-action from 2 to 3

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 2 to 3.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@v2...v3)

---
updated-dependencies:
- dependency-name: docker/setup-buildx-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/build.yml

@@ -190,7 +190,7 @@ jobs:
       # Start a BuildX builder. We'll use the outputs later so give it an ID.
       - name: Setup Docker Buildx
         id: buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
 
       # We'll tell BuildX to `--cache-from` this folder to speed up the build
       # of our `appscope-builder` image. 
@@ -573,7 +573,7 @@ jobs:
 
       - name: Setup Docker Buildx
         id: buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
 
       # We skip this step if we're not going to push the resulting container image
       - name: Login to Container Registry