Bump docker/setup-buildx-action from 2.5.0 to 2.6.0 (#568)

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 2.5.0 to 2.6.0.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@4b4e9c3...6a58db7)

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

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

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -68,7 +68,7 @@ jobs:
         uses: docker/setup-qemu-action@2b82ce82d56a2a04d2637cd93a637ae1b359c0a7 # v2.2.0
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@4b4e9c3e2d4531116a6f8ba8e71fc6e2cb6e6c8c # v2.5.0
+        uses: docker/setup-buildx-action@6a58db7e0d21ca03e6c44877909e80e45217eed2 # v2.6.0
 
       - name: Build
         run: |

.github/workflows/release.yaml

@@ -56,7 +56,7 @@ jobs:
         uses: docker/setup-qemu-action@2b82ce82d56a2a04d2637cd93a637ae1b359c0a7 # v2.2.0
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@4b4e9c3e2d4531116a6f8ba8e71fc6e2cb6e6c8c # v2.5.0
+        uses: docker/setup-buildx-action@6a58db7e0d21ca03e6c44877909e80e45217eed2 # v2.6.0
 
       - name: Login to registry
         uses: docker/login-action@465a07811f14bebb1938fbed4728c6a1ff8901fc # v2.2.0