chore(deps): bump file-type and serverless

Removes [file-type](https://github.com/sindresorhus/file-type). It's no longer used after updating ancestor dependency [serverless](https://github.com/serverless/serverless). These dependencies need to be updated together.


Removes `file-type`

Updates `serverless` from 3.40.0 to 4.38.1
- [Release notes](https://github.com/serverless/serverless/releases)
- [Changelog](https://github.com/serverless/serverless/blob/main/RELEASE_PROCESS.md)
- [Commits](https://github.com/serverless/serverless/compare/v3.40.0...sf-core@4.38.1)

---
updated-dependencies:
- dependency-name: file-type
  dependency-version:
  dependency-type: indirect
- dependency-name: serverless
  dependency-version: 4.38.1
  dependency-type: direct:production
...

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Author: dependabot[bot]