refactor(compiler-cli): remove unecessary type assertion

microsoft/TypeScript#43966 was fixed in 4.3.1

Author: JeanMeche

Diff for: packages/compiler-cli/src/ngtsc/scope/src/dependency.ts

@@ -139,12 +139,9 @@ export class MetadataDtsModuleScopeResolver implements DtsModuleScopeResolver {
       return dirOrPipe;
     }
 
-    // TypeScript incorrectly narrows the type here:
-    // https://github.com/microsoft/TypeScript/issues/43966.
-    // TODO: Remove/Update once https://github.com/microsoft/TypeScript/issues/43966 is resolved.
     return {
       ...dirOrPipe,
       ref: ref.cloneWithAlias(alias),
-    } as T;
+    };
   }
 }