Bump mistletoe from 1.0.1 to 1.2.1 in /caster-back

[dependabot]

Bumps mistletoe from 1.0.1 to 1.2.1.

Release notes

Sourced from mistletoe's releases.

v1.2.1

Fixed

• In v1.2.0, due to #182, using HTMLRenderer (the old class name) directly from the mistletoe package stopped working.

v1.2.0

Changed

• Do not escape double or single quotes by default (#181).
• As in GFM, tables are allowed to interrupt paragraphs by default (#166 via #187). Set mistletoe.block_token.Table.interrupt_paragraph to false if you need the old behavior.
• PygmentsRenderer no longer throws a ClassNotFound error if there is a code language specified which is not supported by the Pygments highlighter (#183). If you still need to get the error, simply pass fail_on_unsupported_language=True to the renderer's constructor.
• Use strict PascalCase for class names (#182). The old names like HTMLRenderer are marked as deprecated.

For contributors:

• Unify assertEqual() calls in all the tests (#185).
• Starting to use requirements.txt.
• Scheme renderer's __main__ section turned into a proper unit test (#189).
• The possibility of a block token to interrupt a paragraph was generalized (#187). A token class just needs to define the check_interrupts_paragraph(cls, lines) -> bool method.

Fixed

• FileWrapper's methods anchor/reset are DEPRECATED, use a more versatile get_pos/set_pos approach instead (#186).
• LaTeXRenderer: Escape special characters in URLs of generated links (#114 via #190).

v1.1.0

Added

• MarkdownRenderer - the long awaited renderer for outputting parsed AST back to the Markdown syntax (#4, #162). 🎉 For this, parsing was extended to store additional information about the input markdown.
• New options to control whether HTMLRenderer should escape double and/or single quotes (#176).

Changed

• "Simpler is better!": Revert back to HTMLRenderer not escaping single quotes by default (#176). Note that we plan to extend this to not escaping double quotes in the next version.
• As a side effect of #162, the AST token classes and parsing process was changed for more uniform behavior and API (#163).
• ASTRenderer no longer outputs all token attributes, but only those listed in Token.repr_attributes (#172).

Fixed

• Token.__repr__() no longer outputs class attributes (#172).
• Make Scheme (scheme.py) work again (7883f58d35b82).
• Make CI work again (#121). Good news for both the maintainers and the contributors.

Special thanks go to @​anderskaplan as the most active contributor of this release. 💪

Commits

• ac3ec41 chore: version 1.2.1
• b02b6a1 fix: make mistletoe.HTMLRenderer work again
• 45f5c61 chore: next version is 1.2.1
• 6727dd4 chore: next dev version
• 27b6013 chore: version 1.2.0
• ce6b54f refactor: use strict PascalCase for class names (#182)
• 9956a8b test: unify assertEqual calls in all the tests (#185)
• ecb1565 fix: escape special characters in URLs (#190)
• c7ecfa2 Added an option to the Table class to interrupt paragraphs or not during pars...
• 04b0c0e Made tables interrupt paragraphs (#166).
• Additional commits viewable in compare view

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