Update dependency marko to v2.2.0

[elastic-renovate-prod]

This PR contains the following updates:

Package	Type	Update	Change
marko	project.dependencies	minor	==2.0.3 -> ==2.2.0

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Release Notes

frostming/marko (marko)

v2.2.0

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Added

• Add comprehensive usage documentation guide.
• Support GFM alerts in GitHub Flavored Markdown extension.

Changed

• Make python-slugify dependency optional for the TOC extension.

Fixed

• Fix code formatting issues.

v2.1.4

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Fixed

• Correct the parsing of LinkRefDef if it is the last line but doesn't end with a line break.

v2.1.3

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Fixed

• Fix a recursion error when dispatching render methods in extensions.
• Initialize children attribute when creating a Document instance.

v2.1.2

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Changed

• Update the GFM spec to the latest master branch.
• Update the CommonMark spec to 0.31.2.

v2.1.1

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Fixed

• Reference link will not render if the reference definition doesn't end with newline.

v2.1.0

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Changed

• Drop support of Python 3.7.

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