chore(python): bump idna from 3.4 to 3.7 in .kokoro#1897

parthea merged 4 commits intomaingoogleapis/python-bigquery:mainfrom

owl-bot-update-lock-5a4c19d17e597b92d786e569be101e636c9c2817731f80a5adec56b2aa8fe070googleapis/python-bigquery:owl-bot-update-lock-5a4c19d17e597b92d786e569be101e636c9c2817731f80a5adec56b2aa8fe070Copy head branch name to clipboard