chore(theming): bump theming package to fix the build

Author: dkamburov

package-lock.json

@@ -60,7 +60,7 @@
     "igniteui-angular-charts": "^20.0.0",
     "igniteui-angular-core": "^20.0.0",
     "igniteui-angular-maps": "^20.0.0",
-    "igniteui-theming": "^19.1.2",
+    "igniteui-theming": "^20.0.0",
     "igniteui-webcomponents": "^6.1.0",
     "minireset.css": "~0.0.4",
     "rxjs": "~7.8.0",