Update conda_build_config.yaml: python 3.7

3 jobs for v1.8.0rc3 in 8 minutes and 17 seconds (queued for 2 seconds)
latest
Status Job ID Name Coverage
  Build
passed build-linux #21667
linux

00:06:14

 
  Build Noarch
passed build-noarch #21668
conda

00:00:30

 
  Deploy
passed deploy-stable #21669
linux conda

00:01:32