Enable platform version field in CLI

[Mrtenz]

Following #2803, we should enable adding/fixing of the platform version field in the CLI by uncommenting this line:

snaps/packages/snaps-utils/src/manifest/validators/index.ts

Lines 11 to 12 in 50b8f80

	// TODO: Uncomment the following line after the next release.
	// export * from './platform-version';