Bump @types/google-protobuf from 3.7.3 to 3.7.4 in /npm-package (#775)

Bumps [@types/google-protobuf](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/google-protobuf) from 3.7.3 to 3.7.4.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/google-protobuf)

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