build: update merge script patch branch to 10.1.x (#20058)

Author: devversion

.ng-dev/merge.ts

@@ -12,7 +12,7 @@ export const merge = (): MergeConfig => {
 
   // TODO(devversion) Clean this up once the label/branching has been finalized.
   // let {minor, patch} = determineMergeBranches(currentVersion, '@angular/cdk');
-  const patch = '10.0.x';
+  const patch = '10.1.x';
   const minor = 'master';
 
   return {