Exclude `sun._` and `com.sun._` from semanticdb-scalac jar
Exclude `sun._` and `com.sun._` from semanticdb-scalac jar

This slims the fatjar from 20mb down to 12mb. I don't know why these
artifacts started being included in the fatjar but I suspect it's caused
by the custom javaHome settings.

xeno-by/scalameta,scalameta/scalameta,xeno-by/scalameta,olafurpg/scalameta,scalameta/scalameta,scalameta/scalameta,olafurpg/scalameta,scalameta/scalameta,olafurpg/scalameta,xeno-by/scalameta,scalameta/scalameta