There is a vulnerability in lxml:4.8.0,upgrade recommended

[QiAnXinCodeSafe]

qlib/scripts/data_collector/br_index/requirements.txt

Line 11 in 667fb0e

lxml==4.8.0

CVE-2022-2309

Recommended upgrade version：4.9.1

[chuhuan88]

Hello, can you share the downloaded dataset with me, I can't get on Yahoo, thank you very much.

[Fivele-Li]

Hi, would you mind sending a PR to fix this issue and become one of the contributor of Qlib?

[Fivele-Li]

#1399 this package needs update too.

[github-actions]

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