test: fix assertion message in test_async.c #46396

	name: Test Linux

	on:
	pull_request:
	paths-ignore:
	- README.md
	- .github/**
	- '!.github/workflows/test-linux.yml'
	types: [opened, synchronize, reopened, ready_for_review]
	push:
	branches:
	- main
	- canary
	- v[0-9]+.x-staging
	- v[0-9]+.x
	paths-ignore:
	- README.md
	- .github/**
	- '!.github/workflows/test-linux.yml'

	concurrency:
	group: ${{ github.workflow }}-${{ github.head_ref \|\| github.run_id }}
	cancel-in-progress: true

	env:
	PYTHON_VERSION: '3.11'
	FLAKY_TESTS: keep_retrying

	permissions:
	contents: read

	jobs:
	test-linux:
	if: github.event.pull_request.draft == false
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@c85c95e3d7251135ab7dc9ce3241c5835cc595a9 # v3.5.3
	with:
	persist-credentials: false
	- name: Set up Python ${{ env.PYTHON_VERSION }}
	uses: actions/setup-python@61a6322f88396a6271a6ee3565807d608ecaddd1 # v4.7.0
	with:
	python-version: ${{ env.PYTHON_VERSION }}
	- name: Environment Information
	run: npx envinfo
	- name: Build
	run: make build-ci -j2 V=1 CONFIG_FLAGS="--error-on-warn"
	- name: Test
	run: make run-ci -j2 V=1 TEST_CI_ARGS="-p actions --measure-flakiness 9"

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