Update docker/setup-buildx-action action to v3.12.0

| datasource  | package                    | from    | to      |
| ----------- | -------------------------- | ------- | ------- |
| github-tags | docker/setup-buildx-action | v3.11.1 | v3.12.0 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -87,7 +87,7 @@ jobs:
         if: github.event_name != 'pull_request'
 
       - name: Docker Buildx
-        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
+        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3.12.0
 
       - name: Docker meta
         id: meta

.github/workflows/e2e-test.yml

@@ -46,7 +46,7 @@ jobs:
           echo "exists=${exists}" >> $GITHUB_OUTPUT
 
       - name: Docker Buildx
-        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
+        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3.12.0
         if: steps.image_exists.outputs.exists == 'false'
 
       - name: Build Image

.github/workflows/release-operator.yml

@@ -116,7 +116,7 @@ jobs:
           platforms: arm64
 
       - name: Docker Buildx
-        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435 # v3.11.1
+        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f # v3.12.0
 
       - name: Output Variables
         id: vars