Unpin mime and update to v4 or latest

Currently mime remains stuck on v3 since it requires us to use ESM imports. Once we have this repository able to support ESM imports we should update mime to v4 or latest

From their docs:

```
Note

mime@4 is now latest. If you're upgrading from mime@3, note the following:

mime@4 is API-compatible with mime@3, with one two exceptions:
Direct imports of mime properties https://github.com/broofa/mime/issues/295
mime.define() cannot be called on the default mime object
ESM module support is required. [ESM Module FAQ](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c).
Requires an [ES2020](https://caniuse.com/?search=es2020) or newer runtime
Built-in Typescript types (@types/mime no longer needed)
```