The tags property in LabService.Lab.Update method should be dictionary not string list

The tags property in [LabService.Lab.Update](https://learn.microsoft.com/en-us/rest/api/labservices/labs/update?tabs=HTTP) method should be dictionary not string list. And it should be aligned with the tags property in [LabService.Lab.Create](https://learn.microsoft.com/en-us/rest/api/labservices/labs/create-or-update?tabs=HTTP#code-try-0) method. So suggest to fix it. Thanks.

Compare the tags property in the linked LabService.Lab.Update API documentation with the corresponding property in LabService.Lab.Create. Locate the Azure REST API specification source for these operations, then verify that the Update definition uses the same dictionary shape as Create and that the generated documentation reflects the correction.

Written by the indexing model from the issue text.