Cannot use gitpkg packages in snack

### Summary

> package.json (9:5)
Invalid dependency 'react-native-gifted-chat' (version 'https://github.com/myckhel/react-native-gifted-chat.git#react-native-gifted-chat-v0.16.7-gitpkg' is not a valid semver)
Retry

### What platform(s) does this occur on?

Android, iOS, Web

### SDK Version

41

### Reproducible demo or steps to reproduce from a blank project

Add:
`"react-native-gifted-chat": "https://github.com/myckhel/react-native-gifted-chat.git#react-native-gifted-chat-v0.16.7-gitpkg",`
to package.json

Start with the blank-project reproduction and inspect how the package.json dependency is parsed and validated in Snack. Confirm the behavior across Android, iOS, and Web, then verify that the gitpkg URL is accepted as a dependency without the invalid-semver error.

Written by the indexing model from the issue text.