chore: update scripts/update-sentry-android-gradle-plugin.sh to 6.4.0… #3193

Job	Run time
bundler-plugins	25s
javascript	26s
maestro	21s
cli	19s
sentry-android-gradle-plugin	23s
android	47s
sample-rn	3m 58s
cocoa	26s
wizard	19s
	7m 24s

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