deps(theming): bump to theming version with dark chat schemas

Author: simeonoff

package-lock.json

@@ -81,7 +81,7 @@
     "globby": "^14.1.0",
     "husky": "^9.1.7",
     "ig-typedoc-theme": "^6.2.3",
-    "igniteui-theming": "^19.3.1",
+    "igniteui-theming": "^20.0.0-beta.2",
     "keep-a-changelog": "^2.7.0",
     "lint-staged": "^16.1.6",
     "lit-analyzer": "^2.0.3",