Upgrade @ngrx/store and @ngrx/effects from ^15.4.0 to ^16.3.0

NgRx follows Angular's versioning scheme: NgRx 15 targets Angular 15,
NgRx 16 targets Angular 16. Since Angular packages are being upgraded
to 16.x (in PR #67), NgRx must also be upgraded to 16.x to maintain
a supported configuration and avoid peer dependency mismatches.

Author: cursoragent

package.json

@@ -75,8 +75,8 @@
     "@angular/platform-browser": "^15.2.9",
     "@angular/platform-browser-dynamic": "^15.2.9",
     "@angular/router": "^15.2.9",
-    "@ngrx/effects": "^15.4.0",
-    "@ngrx/store": "^15.4.0",
+    "@ngrx/effects": "^16.3.0",
+    "@ngrx/store": "^16.3.0",
     "@polymer/decorators": "^3.0.0",
     "@polymer/iron-behaviors": "^3.0.1",
     "@polymer/iron-collapse": "^3.0.1",