{CI} Install dependencies using requirements.py3.Linux.txt

[wangzelin007]

---

Because 1.24.0 has breaking change with 1.21.1.
So we bump azure-core version to 1.21.1 to fix CI error:
https://dev.azure.com/azure-sdk/public/_build/results?buildId=1561389&view=logs&j=9c80867e-ccda-50f1-65bc-e11447f3cda9&t=8e28b004-aba6-5a56-67c2-9d40a66e3ed9

Test screenshot：

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• Have you run azdev style <YOUR_EXT> locally? (pip install azdev required)
• Have you run python scripts/ci/test_index.py -q locally?

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The precondition is to put your code inside this repository and upgrade the version in the pull request but do not modify src/index.json.

[yonzhan]

CI

[jiasli]

The document says Azure-AsyncOperation has higher priority:

https://docs.microsoft.com/en-us/azure/azure-resource-manager/management/async-operations#url-to-monitor-status