update stackblitz package.json to v15 (#1179)

Author: mmalerba

src/assets/stack-blitz/package.json

@@ -10,26 +10,26 @@
   },
   "private": true,
   "dependencies": {
-    "@angular/animations": "~15.0.0-rc.3",
+    "@angular/animations": "~15.0.0",
     "@angular/cdk": "${version}",
-    "@angular/common": "~15.0.0-rc.3",
-    "@angular/compiler": "~15.0.0-rc.3",
-    "@angular/core": "~15.0.0-rc.3",
-    "@angular/forms": "~15.0.0-rc.3",
+    "@angular/common": "~15.0.0",
+    "@angular/compiler": "~15.0.0",
+    "@angular/core": "~15.0.0",
+    "@angular/forms": "~15.0.0",
     "@angular/material": "${version}",
     "@angular/material-moment-adapter": "${version}",
-    "@angular/platform-browser": "~15.0.0-rc.3",
-    "@angular/platform-browser-dynamic": "~15.0.0-rc.3",
-    "@angular/router": "~15.0.0-rc.3",
+    "@angular/platform-browser": "~15.0.0",
+    "@angular/platform-browser-dynamic": "~15.0.0",
+    "@angular/router": "~15.0.0",
     "moment": "^2.18.1",
     "rxjs": "~7.4.0",
     "tslib": "^2.3.0",
     "zone.js": "~0.11.5"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "~15.0.0-rc.3",
-    "@angular/cli": "~15.0.0-rc.3",
-    "@angular/compiler-cli": "~15.0.0-rc.3",
+    "@angular-devkit/build-angular": "~15.0.0",
+    "@angular/cli": "~15.0.0",
+    "@angular/compiler-cli": "~15.0.0",
     "@types/jasmine": "~3.10.0",
     "@types/node": "^12.11.1",
     "jasmine-core": "~3.10.0",