chore(deps): bump step-security/setup-buildx-action from 3.12.0 to 4.0.0

Bumps [step-security/setup-buildx-action](https://github.com/step-security/setup-buildx-action) from 3.12.0 to 4.0.0.
- [Release notes](https://github.com/step-security/setup-buildx-action/releases)
- [Commits](step-security/setup-buildx-action@c60a792...f931205)

---
updated-dependencies:
- dependency-name: step-security/setup-buildx-action
  dependency-version: 4.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/docker.yml

@@ -43,7 +43,7 @@ jobs:
           uses: docker/setup-qemu-action@c7c53464625b32c7a7e944ae62b3e17d2b600130 # v3.7.0
 
         - name: Set up Docker Buildx
-          uses: step-security/setup-buildx-action@c60a792b446ef83310733d5cd9d0c8d6870d043f # v3.12.0
+          uses: step-security/setup-buildx-action@f931205d68723ad9589fd2a7e2ece238bf9de341 # v4.0.0
 
         - name: Build and push Docker image
           uses: step-security/docker-build-push-action@a8c3d08b23f8be6aeed43eb1a14ce6fe51284438 # v6.18.0