Fix platform Typings

[cipolleschi]

Summary

This PR fixes some typings in the platform files. The prerelease value is actually a string as it can assume various values, not just numbers. We typically use rc.W, where only W is a number, but for local testing, for example, we use completely different strings.

Changelog

[INTERNAL] [FIXED] - Use ?string as prerelease type.

Test Plan

• CircleCI must be green on the job that were failing for this problem.

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	8,519,141	-271
android	hermes	armeabi-v7a	7,834,736	-971
android	hermes	x86	8,998,993	+442
android	hermes	x86_64	8,854,061	-654
android	jsc	arm64-v8a	9,141,836	+1,272
android	jsc	armeabi-v7a	8,333,483	+706
android	jsc	x86	9,196,423	+2,189
android	jsc	x86_64	9,454,250	+940

Base commit: 92b8981
Branch: main