fix(sec): upgrade scrapy-splash to 0.8.0

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What happened？

There are 1 security vulnerabilities found in scrapy-splash 0.7.2

• CVE-2021-41124

What did I do？

Upgrade scrapy-splash from 0.7.2 to 0.8.0 for vulnerability fix

What did you expect to happen？

Ideally, no insecure libs should be used.

The specification of the pull request

PR Specification from OSCS