Update docker/setup-buildx-action action to v4

Author: renovate[bot]

.github/workflows/build.yml

@@ -60,7 +60,7 @@ jobs:
         run: echo "pma=$(cat .phpmyadmin-version)" >> "$GITHUB_OUTPUT"
 
       - uses: docker/setup-qemu-action@c7c53464625b32c7a7e944ae62b3e17d2b600130 # v3.7.0
-      - uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3.12.0
+      - uses: docker/setup-buildx-action@bb05f3f5519dd87d3ba754cc423b652a5edd6d2c # v4.2.0
 
       # Pushing only happens from main and the schedule: a pull request must be
       # able to prove the image still builds without being able to publish it.