Bump markdown2 from 2.5.0 to 2.5.1

[dependabot[bot]]

Bumps markdown2 from 2.5.0 to 2.5.1.

Changelog

Sourced from markdown2's changelog.

python-markdown2 2.5.1

• [pull #590] Fix underscores within bold text getting emphasized (#589)
• [pull #591] Add Alerts extra
• [pull #595] Fix img alt text being processed as markdown (#594)
• [pull #598] Add link-shortrefs extra (#597)
• [pull #600] Use urandom for SECRET_SALT
• [pull #602] Fix XSS issue in safe mode (#601)
• [pull #604] Fix XSS injection in image URLs (#603)

Commits

• c736d6f prepare for 2.5.1 release
• 215f096 Merge pull request #598 from Crozzers/gfm-link-refs
• d49f798 Merge branch 'master' into gfm-link-refs
• 929d505 Cleanup, changes, contributors
• 6ea287c Merge pull request #600 from rebane2001/patch-1
• cc432bf Merge pull request #602 from Crozzers/fix-xss-601
• e266576 Merge branch 'master' into fix-xss-601
• ded5e74 Merge pull request #604 from Crozzers/fix-xss-603
• 1b3d705 Expand link shortcut tests in XSS issue 604 case
• b633861 Fix XSS injection in image URLs (#603)
• Additional commits viewable in compare view

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