Merge pull request #1816 from alphagov/dependabot/github_actions/docker/setup-buildx-action-3.12.0

Bump docker/setup-buildx-action from 3.11.1 to 3.12.0

Author: theseanything

.github/workflows/docker_build.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-24.04-arm
     steps:
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
+        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3.12.0
 
       - name: Build
         uses: docker/build-push-action@263435318d21b8e681c14492fe198d362a7d2c83 # v6.18.0