chore(python): use ubuntu 22.04 in docs image (#368)

Source-Link: https://github.com/googleapis/synthtool/commit/f15cc72fb401b4861cedebb10af74afe428fb1f8
Post-Processor: gcr.io/cloud-devrel-public-resources/owlbot-python:latest@sha256:bc5eed3804aec2f05fad42aacf973821d9500c174015341f721a984a0825b6fd
2 files changed