Bump docker/setup-buildx-action in the actions group

Bumps the actions group with 1 update: [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action).


Updates `docker/setup-buildx-action` from 3.11.1 to 3.12.0
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](e468171a9d...8d2750c68a)

---
updated-dependencies:
- dependency-name: docker/setup-buildx-action
  dependency-version: 3.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: actions
...

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

.github/workflows/gha-publish-chart.yaml

@@ -75,7 +75,7 @@ jobs:
         uses: docker/setup-qemu-action@c7c53464625b32c7a7e944ae62b3e17d2b600130
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435
+        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f
         with:
           # Pinning v0.9.1 for Buildx and BuildKit v0.10.6
           # BuildKit v0.11 which has a bug causing intermittent

.github/workflows/gha-validate-chart.yaml

@@ -67,7 +67,7 @@ jobs:
           ct lint --config charts/.ci/ct-config-gha.yaml
 
       - name: Set up docker buildx
-        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435
+        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f
         if: steps.list-changed.outputs.changed == 'true'
         with:
           version: latest

.github/workflows/global-publish-canary.yaml

@@ -113,7 +113,7 @@ jobs:
         uses: docker/setup-qemu-action@c7c53464625b32c7a7e944ae62b3e17d2b600130
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@e468171a9de216ec08956ac3ada2f0791b6bd435
+        uses: docker/setup-buildx-action@8d2750c68a42422c14e847fe6c8ac0403b4cbd6f
         with:
           version: latest