Remove minSdk pin workaround

[voczi]

Problem fixed after desugar_jdk_libs_nio was updated to version 2.1.0.
#16968
google/desugar_jdk_libs@c7dbf2c

[Arthur-Milchior]

Task :AnkiDroid:minifyPlayReleaseWithR8 FAILED
ERROR: Missing classes detected while running R8. Please add the missing classes or apply additional keep rules that are generated in /home/runner/work/Anki-Android/Anki-Android/AnkiDroid/build/outputs/mapping/playRelease/missing_rules.txt.
ERROR: R8: Missing class com.ichi2.anki.dialogs.tags.TagsDialogListener$-CC (referenced from: void com.ichi2.anki.dialogs.tags.TagsDialogListener.())
Missing class com.ichi2.anki.reviewer.Binding$-CC (referenced from: void com.ichi2.anki.reviewer.Binding.())

I'll restart just in case, but I would not be surprised it's a real issue.

[voczi]

Assuming it's a constructor now being called through reflection because of minSdk=23. Should just be a matter of adding the respective PG rule.

[voczi]

I'm just trying to make R8 keep the Kotlin metadata now, but I doubt it will work.
After taking a closer look at this, I've reached many dead-ends where it's simply stated to increase minSdk>=24. So I'm not sure, but I think there are two alternatives where we either 1) just close this PR and forget about it or 2) update minSdk to 24 once and for all (important decision for the upcoming 2.19 release).
I guess there's also a third option where we just go scorched earth and re-disable all of the APK optimizations.

[mikehardy]

I think we're reasonably close to getting 2.19 out the door - how close of course I do not know, but how about this option:

• don't spend more time on this until minSdk is 24, just let it sit as blocked by dependency
• get 2.19 out, then bump minSdk to 24
• then clear this out ?

[voczi]

• get 2.19 out, then bump minSdk to 24

Sounds good to me.