Bump docker/setup-buildx-action from 3.3.0 to 3.4.0

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 3.3.0 to 3.4.0.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@d70bba7...4fd8129)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/k8s-content-pr.yaml

@@ -65,7 +65,7 @@ jobs:
       - name: Set up QEMU
         uses: docker/setup-qemu-action@5927c834f5b4fdf503fca6f4c7eccda82949e1ee # v3
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@d70bba72b1f3fd22344832f00baa16ece964efeb # v3
+        uses: docker/setup-buildx-action@4fd812986e6c8c2a69e18311145f9371337f27d4 # v3
       - name: Docker metadata
         id: meta
         uses: docker/metadata-action@8e5442c4ef9f78752691e2d8f8d19755c6f78e81 # v5