chore: test minimum dependencies in python 3.7 (googleapis#463)

Author: parthea

testing/constraints-3.7.txt

@@ -0,0 +1,12 @@
+# This constraints file is used to check that lower bounds
+# are correct in setup.py
+# List *all* library dependencies and extras in this file.
+# Pin the version to the lower bound.
+#
+# e.g., if setup.py has "foo >= 1.14.0, < 2.0.0dev",
+sqlalchemy==1.2.0
+google-auth==1.25.0
+google-cloud-bigquery==2.25.2
+google-cloud-bigquery-storage==2.0.0
+google-api-core==1.31.5
+pyarrow==3.0.0