Bump docker/setup-buildx-action from 2.5.0 to 2.8.0

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 2.5.0 to 2.8.0.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@v2.5.0...v2.8.0)

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

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

.github/workflows/kind-e2e.yaml

@@ -40,7 +40,7 @@ jobs:
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2.1.0
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2.5.0
+        uses: docker/setup-buildx-action@v2.8.0
       - name: Set up KinD
         id: kind
         run: |

.github/workflows/pr-validation.yaml

@@ -132,7 +132,7 @@ jobs:
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2.1.0
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2.5.0
+        uses: docker/setup-buildx-action@v2.8.0
       - name: Build and load (current arch)
         run: |
           docker buildx build --load -t ${{ env.NAME }}:${{ steps.prep.outputs.VERSION }} .

.github/workflows/release-container-image.yaml

@@ -37,7 +37,7 @@ jobs:
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2.1.0
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2.5.0
+        uses: docker/setup-buildx-action@v2.8.0
       - name: Login to GitHub Container Registry
         uses: docker/login-action@v2.1.0
         with:

.github/workflows/trivy.yaml

@@ -39,7 +39,7 @@ jobs:
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v2.1.0
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2.5.0
+        uses: docker/setup-buildx-action@v2.8.0
       - name: Build container (multi arch)
         uses: docker/build-push-action@v4.0.0
         with: