chore: prepare for release `v3.8.9` (#798) #307

Job	Run time
Ensure the code builds (OoniStableFullRelease)	1m 43s
Ensure the code builds (OoniStableFdroidRelease)	1m 52s
Ensure the code builds (DwStableFullRelease)	1m 58s
Ensure the code builds (DwStableFdroidRelease)	2m 1s
Run instrumented tests (25, default)	2m 27s
Archive APKs (OoniStableFullDebug)	2m 7s
Run instrumented tests (25, google_apis)	2m 36s
Run unit tests	2m 27s
Archive APKs (OoniStableFdroidDebug)	1m 52s
Run instrumented tests (29, default)	2m 37s
Archive APKs (OoniDevFullDebug)	1m 59s
Run instrumented tests (29, google_apis)	2m 44s
Archive APKs (OoniDevFullDebugAndroidTest)	1m 57s
Archive APKs (DwStableFullDebug)	2m 8s
Archive APKs (DwStableFdroidDebug)	2m 1s
Archive APKs (DwDevFullDebug)	1m 55s
Upload artifact to Firebase App Distribution	39s
	35m 3s

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