GitlabManager => Update type for newer gitbeaker version

managers/SharedGitlabManager.ts

-import axios                                                 from 'axios';
-import * as GitlabCore                                       from '@gitbeaker/core';
-import { GitbeakerRequestError }                             from '@gitbeaker/requester-utils';
-import { Gitlab, PipelineSchema, ProjectSchema, UserSchema } from '@gitbeaker/rest';
-import GitlabToken                                           from '../types/Gitlab/GitlabToken.js';
+import axios                                                                   from 'axios';
+import * as GitlabCore                                                         from '@gitbeaker/core';
+import { GitbeakerRequestError }                                               from '@gitbeaker/requester-utils';
+import { Gitlab, PipelineSchema, ProjectSchema, SimpleUserSchema, UserSchema } from '@gitbeaker/rest';
+import GitlabToken                                                             from '../types/Gitlab/GitlabToken.js';
 
 
 class SharedGitlabManager {
@@ -63,7 +63,7 @@ class SharedGitlabManager {
         }
     }
 
-    public async getUserByUsername(username: string): Promise<UserSchema | undefined> {
+    public async getUserByUsername(username: string): Promise<SimpleUserSchema | undefined> {
         try {
             return await this.executeGitlabRequest(async () => {
                 const user = await this.api.Users.all({