Update dependency m2r2 to v0.3.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
m2r2	==0.2.5 -> ==0.3.4

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Release Notes

crossnox/m2r2 (m2r2)

v0.3.4

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• Fixed dependencies errors

v0.3.3.post2

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v0.3.3

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• Drop support for all python versions prior to 3.7
• Upgrade to docutils 0.19

v0.3.2

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• Pin mistune version

v0.3.1

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• Fix argparse for python3.10

v0.3.0

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• Add support for mermaid code
• Change bump for bump2version

v0.2.8

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• Fix bug that made multiple inline mathematical expressions fail to render

v0.2.7

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• Add official python3.9 support
• Fix classifiers

v0.2.6

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• Fix error for Sphinx3.3.0

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