Fix build warning: "Unexpected any" for file data in upload torrent form

[josecelano]

$ npm run lint

> torrust-index-api-lib@1.0.0-alpha.3 lint
> eslint --ext ".ts,.js,.vue" --ignore-path .gitignore .


/home/josecelano/Documents/github/committer/me/torrust/torrust-index-api-lib/src/modes/rest/resources/torrent.ts
  54:11  error  Unexpected any. Specify a different type  @typescript-eslint/no-explicit-any
  98:34  error  Unexpected any. Specify a different type  @typescript-eslint/no-explicit-any

✖ 2 problems (2 errors, 0 warnings)