text: Title: There are Chinese characters in my project, but after calling the visualize_document_datamap() method, the characters appear as garbled text.
  Body: ### Have you searched existing issues?  🔎
  
  - [X] I have searched and found no existing issues
  
  ### Desribe the bug
  
  fig = topic_model.visualize_document_datamap(
      sentences,
      topics=topics,
      reduced_embeddings=reduced_embeddings,
      #custom_labels=custom_labels,
      title='文档和主题的分布',
      sub_title='基于 BERTopic 的主题建模',
      width=1200,
      height=1200
  )
  Even after setting 
  plt.rcParams['font.sans-serif'] = ['SimHei'],
   I still can't see the characters.
  
  ### Reproduction
  
  ```python
  from bertopic import BERTopic
  # with the reduced embeddings
  reduced_embeddings = UMAP(n_neighbors=15, n_components=2, min_dist=0.0, metric='cosine').fit_transform(embeddings)
  fig = topic_model.visualize_document_datamap(
      sentences,
      topics=topics,
      reduced_embeddings=reduced_embeddings,
      #custom_labels=custom_labels,
      title='文档和主题的分布',
      sub_title='基于 BERTopic 的主题建模',
      width=1200,
      height=1200
  )
  ```
  
  
  ### BERTopic Version
  
  0.16.4