Updated Upstream (BungeeCord)

Upstream has released updates that appear to apply and compile correctly.
This update has not been tested by PaperMC and as with ANY update, please do your own testing

BungeeCord Changes:
d81040cd Bump lombok version
d7538df9 #3815: Ensure ping response for unthrottling
2516de65 #3816: Upgrade Netty to 4.2.0.Final
1da3a8c2 #3814: Fire exception in pipeline if async task in eventloop throws exception
f6151dce Bump version to 1.21-R0.3-SNAPSHOT
96677437 Release 1.21-R0.2
7587f033 SPIGOT-8024, #3811, #3812: Add versioned chat serialization (beta)

Author: linsaftw