Update dependency panflute to v2

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
panflute	==1.12.5 -> ==2.3.1

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Release Notes

sergiocorreia/panflute (panflute)

v2.3.0: 2.3.1

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• Document that pandoc 3.1.* is supported
• Document older pandoc 2.19 support by @​lewer in https://github.com/sergiocorreia/panflute/pull/226
• [Metadata] Make MetaMap/List completely pythonic by @​Dabsunter in https://github.com/sergiocorreia/panflute/pull/233
• Figure, Table: fix to_json() crash if caption is None by @​garethstockwell in https://github.com/sergiocorreia/panflute/pull/230

New Contributors

• @​lewer made their first contribution in https://github.com/sergiocorreia/panflute/pull/226
• @​Dabsunter made their first contribution in https://github.com/sergiocorreia/panflute/pull/233
• @​garethstockwell made their first contribution in https://github.com/sergiocorreia/panflute/pull/230

Full Changelog: sergiocorreia/panflute@2.3.0...v2.3.0

v2.2.3: 2.2.3

• Added equality operator to element objects (Doc, Block, Inline, Str, etc.)
• Misc. bugfixes

v2.1.3

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Update documentation and dependencies:

• Add support and test against Python 3.10 and Pandoc 2.16
• Improve test matrix suite
• Test and document lists of elements as return values of filters (the items on the list will be inserted at the same level as the item being replaced)

v2.1.0

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• autofilter.py: add pandoc 2.12+ support to get_filter_dirs
• add pandoc_path argument to run_pandoc(): run_pandoc(text='', args=None, pandoc_path=which('pandoc')
• fix a few docstrings

v2.0.5

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• Fix #​166 ("Regression: panflute.elements.builtin2meta no longer supports subclasses of builtins")
• Improve testing ( #​170, #​169, #​164)

v2.0.4

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• Fix bug with replace_keyword() ; see #​104

v2.0.3: (add support for pandoc 2.11, deprecate support for older versions of pandoc)

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• Add support for pandoc 2.11.1 (pandoc-types 1.22), which introduced a new Underline element and expanded the capabilities of the Table element.
• Remove support for previous versions of pandoc. Users of previous versions of pandoc should install pre-2.0 versions of panflute
• Fix/add tests
• Add the pandoc_version and pandoc_reader_options properties of the Doc() element, which expose environment variables set by pandoc

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