Bump home-assistant/builder/actions/build-image from 2026.06.0 to 2026.09.0 (#234)

Bumps [home-assistant/builder/actions/build-image](https://github.com/home-assistant/builder) from 2026.06.0 to 2026.09.0.
- [Release notes](https://github.com/home-assistant/builder/releases)
- [Commits](home-assistant/builder@4de3518...7412f00)

---
updated-dependencies:
- dependency-name: home-assistant/builder/actions/build-image
  dependency-version: 2026.09.0
  dependency-type: direct:production
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/builder.yml

@@ -68,7 +68,7 @@ jobs:
 
       - name: Build image
         id: build
-        uses: home-assistant/builder/actions/build-image@4de35182ce1e329181bffcbcc84d33db5e2c7e10 # 2026.06.0
+        uses: home-assistant/builder/actions/build-image@7412f0023ea9b6e58e8bb5059f1660f51376f49a # 2026.09.0
         with:
           arch: ${{ matrix.arch }}
           container-registry-password: ${{ secrets.GITHUB_TOKEN }}