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/ci-smart-contract.yml

@@ -118,7 +118,7 @@ jobs:
     if: ${{ needs.check-diffs.outputs.get_diff }}
     steps:
       - uses: actions/checkout@v3
-      - uses: docker/setup-buildx-action@v2
+      - uses: docker/setup-buildx-action@v3
       - name: Build and export
         uses: docker/build-push-action@v4
         with:
@@ -141,7 +141,7 @@ jobs:
         versions: ${{ fromJson(needs.get-cosmwasm-releases.outputs.cosmwasm_versions) }}
     steps:
       - uses: actions/checkout@v3
-      - uses: docker/setup-buildx-action@v2
+      - uses: docker/setup-buildx-action@v3
       - name: Download smart contracts
         uses: dsaltares/fetch-gh-release-asset@master
         with:

.github/workflows/docker.yml

@@ -25,7 +25,7 @@ jobs:
 
       - name: Set up docker buildx
         id: buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
         with:
           endpoint: buildx
           config-inline: |