Update various dependencies + working nullaway

[ZacSweers]

A few dependencies + usage of new lazy task configuration in AGP. Also enabled lazy task management for the gradle plugin, but will hold off on that pending how #1461 goes

[ZacSweers]

Just noticed #1445

Strangely I didn't hit https://issuetracker.google.com/issues/73450622 after updating

[ZacSweers]

... there it is

why doesn't this happen for me locally 🤔

~/dev/android/contributing/butterknife z/updateDeps 2m 54s
❯ gw test

Deprecated Gradle features were used in this build, making it incompatible with Gradle 6.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/5.2/userguide/command_line_interface.html#sec:command_line_warnings

BUILD SUCCESSFUL in 18s
172 actionable tasks: 6 executed, 166 up-to-date

[JakeWharton]

Probably should split up if you want any chance of some of this landing.