Firebase auth provider compilation target is too high

[bjhham]

Only compiles with JDK >= 21

See output:

Execution failed for task ':compileKotlin'.
> Could not resolve all files for configuration ':compileClasspath'.
   > Could not resolve com.kborowy:firebase-auth-provider:1+.
     Required by:
         root project :
      > Dependency resolution is looking for a library compatible with JVM runtime version 17, but 'com.kborowy:firebase-auth-provider:1.1.4' is only compatible with JVM runtime version 21 or newer.