Bump docker/bake-action from 6 to 7

Bumps [docker/bake-action](https://github.com/docker/bake-action) from 6 to 7.
- [Release notes](https://github.com/docker/bake-action/releases)
- [Commits](docker/bake-action@v6...v7)

---
updated-dependencies:
- dependency-name: docker/bake-action
  dependency-version: '7'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/testing.yml

@@ -50,7 +50,7 @@ jobs:
         uses: docker/setup-buildx-action@v3
 
       - name: Build test bench container
-        uses: docker/bake-action@v6
+        uses: docker/bake-action@v7
         with:
           load: true
           push: false
@@ -110,7 +110,7 @@ jobs:
 
       - name: Load test bench containers
         if: matrix.config.os == 'ubuntu-latest'
-        uses: docker/bake-action@v6
+        uses: docker/bake-action@v7
         with:
           load: true
           push: false