Bump markdown2 from 2.3.9 to 2.3.10

Created by: dependabot-preview[bot]

Bumps markdown2 from 2.3.9 to 2.3.10.

Changelog

Sourced from markdown2's changelog.

python-markdown2 2.3.10

• [pull #356] Don't merge sequential quotes into a single blockquote
• [pull #357] use style=text-align for table alignment
• [pull #360] introduce underline extra
• [pull #368] Support for structured and nested values in metadata
• [pull #371] add noopener to external links

Commits

• c5e313c prepare for 2.3.10 release
• 76c1c1f Changes
• a0c9dad Merge branch 'alanhamlett-master'
• 7e809a5 Cleanup conditional and add another test
• 40050e7 fix tests
• fd81de5 add noopener to external links
• 175fe99 Changes and contributors
• e3da4df Merge pull request #368 from andrenasturas/master
• b9c3b69 Test pypy3 not pypy
• 3abfc5f Fix for Pygments version bump in tests
• Additional commits viewable in compare view

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