Update conda_build_config.yaml: added python 3.7

3 jobs for 2-python3-interface-ctor in 6 minutes and 1 second (queued for 3 seconds)
Status Job ID Name Coverage
  Build
passed #21531
linux
build-linux

00:05:33

 
  Build Noarch
passed #21532
conda
build-noarch

00:00:28

 
  Deploy
manual #21533
linux conda allowed to fail manual
deploy-devel