fix getFileExtension missing numeric extensions (e.g. mp4)

Jacky Zhao

2023-08-09 e4950e06a15e34134b9feb064749748080bd59a1

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{
  "printWidth": 100,
  "quoteProps": "as-needed",
  "trailingComma": "all",
  "tabWidth": 2,
  "semi": false
}