Bump home-assistant/builder from 2025.03.0 to 2025.09.0

Bumps [home-assistant/builder](https://github.com/home-assistant/builder) from 2025.03.0 to 2025.09.0.
- [Release notes](https://github.com/home-assistant/builder/releases)
- [Commits](https://github.com/home-assistant/builder/compare/2025.03.0...2025.09.0)

---
updated-dependencies:
- dependency-name: home-assistant/builder
  dependency-version: 2025.09.0
  dependency-type: direct:production
...

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

.github/workflows/onpush_builder.yaml

@@ -177,7 +177,7 @@ jobs:
       - name: Build ${{ matrix.addon }} add-on
         id: builderstep
         if: steps.check.outputs.build_arch == 'true' && steps.dockerfile_check.outputs.has_dockerfile == 'true'
-        uses: home-assistant/builder@2025.03.0
+        uses: home-assistant/builder@2025.09.0
         env:
           CAS_API_KEY: ${{ secrets.CAS_API_KEY }}
         with: