fix: package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ANGULARSSR-13635722

Author: snyk-bot

package.json

@@ -26,7 +26,7 @@
     "@angular/platform-browser-dynamic": "20.1.3",
     "@angular/platform-server": "20.1.3",
     "@angular/router": "20.1.3",
-    "@angular/ssr": "20.1.3",
+    "@angular/ssr": "20.3.6",
     "@ngx-builders/analyze": "4.0.0",
     "@nx/angular": "21.3.7",
     "express": "~4.18.2",