Bump docker/setup-buildx-action from 1 to 3

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 1 to 3.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](https://github.com/docker/setup-buildx-action/compare/v1...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/pr-containers.yml

@@ -24,7 +24,7 @@ jobs:
 
     - name: Set up Docker Buildx
       id: buildx
-      uses: docker/setup-buildx-action@v1
+      uses: docker/setup-buildx-action@v3
       with:
         version: latest
 

.github/workflows/push.yml

@@ -43,7 +43,7 @@ jobs:
 
     - name: Set up Docker Buildx
       id: buildx
-      uses: docker/setup-buildx-action@v1
+      uses: docker/setup-buildx-action@v3
       with:
         version: latest