build(deps): bump docker/setup-buildx-action from 3 to 4

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 3 to 4.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@v3...v4)

---
updated-dependencies:
- dependency-name: docker/setup-buildx-action
  dependency-version: '4'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/agent-writer.yml

@@ -19,7 +19,7 @@ jobs:
         uses: actions/checkout@v5
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Install dependencies
         run: npm ci

.github/workflows/build.yml

@@ -25,7 +25,7 @@ jobs:
     steps:
       -
         name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
         with:
           version: ${{ env.SETUP_BUILDX_VERSION }}
           driver-opts: image=${{ env.SETUP_BUILDKIT_IMAGE }}
@@ -47,7 +47,7 @@ jobs:
         uses: actions/checkout@v5
       -
         name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
       -
         name: Build
         uses: docker/bake-action@v6
@@ -88,7 +88,7 @@ jobs:
         uses: actions/checkout@v5
       -
         name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
       -
         name: Validate
         uses: docker/bake-action@v6

.github/workflows/deploy.yml

@@ -52,7 +52,7 @@ jobs:
             }
       -
         name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
         with:
           version: ${{ env.SETUP_BUILDX_VERSION }}
           driver-opts: image=${{ env.SETUP_BUILDKIT_IMAGE }}

.github/workflows/validate-upstream.yml

@@ -84,7 +84,7 @@ jobs:
             }
       -
         name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
         with:
           version: ${{ env.SETUP_BUILDX_VERSION }}
           driver-opts: image=${{ env.SETUP_BUILDKIT_IMAGE }}