Update sip and build for Python 3.8

3 jobs for v1.9.8rc1 in 24 minutes and 35 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #187560
linux
build-linux

00:23:25

passed #187561
win
build-win

00:20:23

 
  Deploy
passed #187562
linux conda
deploy-stable

00:01:10