build(deps-dev): bump @angular-devkit/build-angular

Bumps [@angular-devkit/build-angular](https://github.com/angular/angular-cli) from 20.3.8 to 20.3.9.
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Changelog](https://github.com/angular/angular-cli/blob/main/CHANGELOG.md)
- [Commits](angular/angular-cli@20.3.8...20.3.9)

---
updated-dependencies:
- dependency-name: "@angular-devkit/build-angular"
  dependency-version: 20.3.9
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -98,7 +98,7 @@
   },
   "devDependencies": {
     "@angular-builders/custom-webpack": "^20.0.0",
-    "@angular-devkit/build-angular": "^20.3.8",
+    "@angular-devkit/build-angular": "^20.3.9",
     "@angular-devkit/schematics": "^20.3.8",
     "@angular/cli": "^20.3.8",
     "@angular/compiler-cli": "^20.3.9",