Update git submodules

* Update frameworks/support from branch 'androidx-main'
  to b42ec84256b50a376d910cd67df0cc992e6f4c16
  - Merge "Fix `unboxValueIfInline` for non-jvm targets" into androidx-main
  - Fix `unboxValueIfInline` for non-jvm targets
    
    Unlike jvm, there is no `unsafeCoerceIntrinsic` for k/js and k/native.
    `unsafeCoerceIntrinsic` uses JVM specific <unsafe-coerce> intrinsic.
    Therefore explicitly extract inlined value.
    
    Test: tested in JB fork
    Change-Id: I1a9b00f2d3857b96711db1697f8bd7dbd677289e