chore(deps): Update nox in .kokoro/requirements.in [autoapprove] (#493)

Source-Link: https://github.com/googleapis/synthtool/commit/92006bb3cdc84677aa93c7f5235424ec2b157146
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:2e247c7bf5154df7f98cce087a20ca7605e236340c7d6d1a14447e5c06791bd6

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