fix(angular): change version of angular migrations so they run during beta (#6454)

Author: FrozenPandaz

packages/angular/migrations.json

@@ -608,7 +608,7 @@
       }
     },
     "12.6.0": {
-      "version": "12.6.0",
+      "version": "12.6.0-beta.11",
       "packages": {
         "jasmine-marbles": {
           "version": "~0.8.3",