Bump docker/setup-buildx-action from 1.7.0 to 2.0.0 (#5976)

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 1.7.0 to 2.0.0.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](https://github.com/docker/setup-buildx-action/compare/f211e3e9ded2d9377c8cadc4489a4e38014bc4c9...dc7b9719a96d48369863986a06765841d7ea23f6)

---
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>

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

polkadot/.github/workflows/release-50_publish-docker-release.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v3
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@f211e3e9ded2d9377c8cadc4489a4e38014bc4c9 # v1.7
+        uses: docker/setup-buildx-action@dc7b9719a96d48369863986a06765841d7ea23f6 # v1.7
       - name: Cache Docker layers
         uses: actions/cache@v3
         with:

polkadot/.github/workflows/release-51_publish-docker-manual.yml

@@ -19,7 +19,7 @@ jobs:
       - name: Checkout sources
         uses: actions/checkout@v3
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@f211e3e9ded2d9377c8cadc4489a4e38014bc4c9 # v1.7
+        uses: docker/setup-buildx-action@dc7b9719a96d48369863986a06765841d7ea23f6 # v1.7
       - name: Cache Docker layers
         uses: actions/cache@v3
         with: