chore: prepare for release `v3.8.9` #302

Job	Run time
Ensure the code builds (OoniStableFullRelease)	1m 47s
Ensure the code builds (OoniStableFdroidRelease)	1m 38s
Ensure the code builds (DwStableFullRelease)	1m 38s
Ensure the code builds (DwStableFdroidRelease)	1m 45s
Run unit tests	2m 1s
Run instrumented tests (25, default)	1h 0m 7s
Archive APKs (OoniStableFullDebug)	1m 38s
Run instrumented tests (25, google_apis)	1h 0m 2s
Archive APKs (OoniStableFdroidDebug)	1m 36s
Run instrumented tests (29, default)	1h 0m 7s
Archive APKs (OoniDevFullDebug)	1m 40s
Run instrumented tests (29, google_apis)	9m 44s
Archive APKs (OoniDevFullDebugAndroidTest)	1m 47s
Archive APKs (DwStableFullDebug)	1m 42s
Archive APKs (DwStableFdroidDebug)	1m 42s
Archive APKs (DwDevFullDebug)	1m 54s
Upload artifact to Firebase App Distribution	46s
	3h 31m 34s

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