bump okio to 1.17.5

[dulmandakh]

Summary

Bump Okio to 1.17.5, which includes fixes for many bugs and crashes since current version. Also removed android.enableR8=false from gradle.properties because it's deprecated. And moved FEST_ASSERT_CORE_VERSION from gradle.properties to build.gradle because it's used in single line.

Changelog

[Android] [Changed] - bump Okio to 1.17.5

Test Plan

RNTester builds and runs as expected.

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
android	hermes	arm64-v8a	7,389,897	0
android	hermes	armeabi-v7a	7,017,213	0
android	hermes	x86	7,832,109	0
android	hermes	x86_64	7,721,595	0
android	jsc	arm64-v8a	9,536,198	0
android	jsc	armeabi-v7a	9,151,226	0
android	jsc	x86	9,400,874	0
android	jsc	x86_64	9,982,584	0

Base commit: 7609883

[analysis-bot]

Platform	Engine	Arch	Size (bytes)	Diff
ios	-	universal	n/a	--

Base commit: 7609883

[facebook-github-bot]

@fkgozali has imported this pull request. If you are a Facebook employee, you can view this diff on Phabricator.

[react-native-bot]

This pull request was successfully merged by @dulmandakh in 1e78e06.

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