chore: [Many APIs] Update gapic-generator-python to v1.20.2 #7309

	on:
	pull_request:
	branches:
	- main
	# Trigger workflow on GitHub merge queue events
	# See https://docs.github.com/en/actions/using-workflows/events-that-trigger-workflows#merge_group
	merge_group:
	types: [checks_requested]
	name: lint

	permissions:
	contents: read

	jobs:
	lint:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v4
	# Use a fetch-depth of 2 to avoid error `fatal: origin/main...HEAD: no merge base`
	# See https://github.com/googleapis/google-cloud-python/issues/12013
	# and https://github.com/actions/checkout#checkout-head.
	with:
	fetch-depth: 2
	- name: Setup Python
	uses: actions/setup-python@v5
	with:
	python-version: "3.10"
	- name: Install nox
	run: \|
	python -m pip install --upgrade setuptools pip wheel
	python -m pip install nox
	- name: Run lint
	env:
	BUILD_TYPE: presubmit
	TEST_TYPE: lint
	PY_VERSION: "3.10"
	run: \|
	ci/run_conditional_tests.sh
	- name: Run lint_setup_py
	env:
	BUILD_TYPE: presubmit
	TEST_TYPE: lint_setup_py
	PY_VERSION: "3.10"
	run: \|
	ci/run_conditional_tests.sh

Provide feedback