fix(deps): add packaging requirement (#62)

* fix(deps): add packaging requirement

* 🦉 Updates from OwlBot

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: busunkim96

setup.py

@@ -31,6 +31,7 @@
 dependencies = [
     "google-api-core[grpc] >= 1.22.2, < 2.0.0dev",
     "proto-plus >= 1.15.0",
+    "packaging >= 14.3",
 ]
 extras = {}
 

testing/constraints-3.6.txt

@@ -7,3 +7,5 @@
 # Then this file should have foo==1.14.0
 google-api-core==1.22.2
 proto-plus==1.16.0
+packaging==14.3
+google-auth==1.24.0  # TODO: remove when google-auth>=1.25.0 si transitively required through google-api-core