Update angularmaterial monorepo to v15

Author: renovate[bot]

package.json

@@ -13,14 +13,14 @@
   "private": true,
   "dependencies": {
     "@angular/animations": "6.1.10",
-    "@angular/cdk": "^6.0.0",
+    "@angular/cdk": "^15.0.0",
     "@angular/cli": "^6.0.0",
     "@angular/common": "6.1.10",
     "@angular/compiler": "6.1.10",
     "@angular/core": "6.1.10",
     "@angular/forms": "6.1.10",
     "@angular/http": "6.1.10",
-    "@angular/material": "^6.0.0",
+    "@angular/material": "^15.0.0",
     "@angular/platform-browser": "6.1.10",
     "@angular/platform-browser-dynamic": "6.1.10",
     "@angular/router": "6.1.10",