Bump docker/setup-buildx-action from 2 to 4

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 2 to 4.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@v2...v4)

---
updated-dependencies:
- dependency-name: docker/setup-buildx-action
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/wipac-cicd.yml

@@ -110,7 +110,7 @@ jobs:
         with:
           ref: ${{ github.sha }}  # lock to triggered commit (github.ref is dynamic)
           fetch-depth: 0  # setuptools-scm needs to access git tags
-      - uses: docker/setup-buildx-action@v3
+      - uses: docker/setup-buildx-action@v4
       - uses: docker/build-push-action@v6
         with:
           context: .
@@ -195,7 +195,7 @@ jobs:
         with:
           ref: ${{ github.sha }}  # lock to triggered commit (github.ref is dynamic)
           fetch-depth: 0  # setuptools-scm needs to access git tags
-      - uses: docker/setup-buildx-action@v2
+      - uses: docker/setup-buildx-action@v4
       - uses: docker/build-push-action@v3
         with:
           context: .