feat: audio support m4a

[shaohuzhang1]

feat: audio support m4a --story=1017864 --user=王孝刚 【应用】上传音频文件类型中支持m4a类型 #2276 https://www.tapd.cn/57709429/s/1654257

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[shaohuzhang1]

There are no significant issues with the current code, but here is a minor suggestion:

1. Remove Trailing Commas: The trailing comma after props.applicationDetails.file_upload_setting could be removed to make the syntax more concise.

Revised Code:

@@ -260,7 +260,7 @@
 const localLoading = computed({
 const imageExtensions=['jpg','jpeg','png','gif','bmp']
 const documentExtensions=['pdf','docx','txt','xls','xlsx','md','html','csv']
 const videoExtensions =['mp4','avi','mov','mkv','flv']
-const audioExtensions=['mp3','wav','ogg','aac']
+const audioExtensions=['mp3','wav','ogg','aac','m4a']

 const getAcceptList = () => {
   const {image , document, audio, video} = props.applicationDetails.file_upload_setting

This change makes the syntax cleaner and less error-prone.

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