v21.2.16
fix(@angular/ssr): prioritize options over environment variables in AngularNodeAppEngine
refactor: update copyright from Google Inc to Google LLC
docs: update ng.ts render function documentation to reflect removal of rendering implementation details
build: update dependency postcss to v8.5.12
build: update `aspect_rules_js` to `3.0.2`
fix(@angular/ssr): validate host headers to prevent header-based SSRF
refactor(@angular/cli): update aio links -> adev links
build: update cross-repo angular dependencies
feat(@angular/ssr): add server routing configuration API
fix(@angular/ssr): introduce DI token to signal route discovery process