⬆️(deps): Bump rdiscount from 2.2.7 to 2.2.7.1

Sourced from rdiscount's changelog.

Version 2.2.7.1 (June 16, 2023)

• Fix to not filter out <style> tags by default in Markdown output, unless filter_styles is enabled
• Fix compilation issue with Clang 16
• Add TruffleRuby to continuous integration

• 8c890c5 2.2.7.1 release
• 1f73bfa Add TruffleRuby in CI
• 48da2e1 Use correctly-typed function pointers for mkd_sta_function_t
• d4f796b Fix Clang error in ext/gethopt.c
• aeb0b68 Merge pull request #153 from davidfstr/bugfix/no-style-flag
• 2a2409e doc: update url of submodule in BUILDING
• df10908 Fix default set MKD_NOSTYLE flag
• See full diff in compare view

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