[Snyk] Security upgrade sphinx from 1.8.6 to 3.0.4

[Kalyan14033]

Snyk has created this PR to fix 1 vulnerabilities in the pip dependencies of this project.

Snyk changed the following file(s):

• requirements-docs.txt

⚠️ Warning

Jinja2 2.11.3 requires MarkupSafe, which is not installed.

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