community/py3-readme_renderer: upgrade to 37.1

https://github.com/pypa/readme_renderer/releases

35.0...37.1

cb717bf5 feat(dev): enable gitpod development (#238)
30b5f9a7 feat: allow admonitions to be rendered (#242)
209bcae1 fix: enable colspan and rowspan attributes (#245)
bb88dabf chore: update codebase for modern python (#244)
e52f9686 fix: allow math in rst (#246)
de0162ae feat: preserve language attribute for code blocks (#247)
5f6fc43f Release 36.0 (#248)
4f5fe3c1 test: confirm handling multiple inline strong (#252)
3f286340 Multiple pyproject.toml fixes (#251)
d853780f feat: convert writer to HTML5 (#253)
78cf418c Remove command-line example from readme (#197)
08bef09f chore: advertise typing status in classifier (#254)
f62ff903 chore: development tweaks (#255)
4ec558c4 test: confirm that unknown lexers emit code blocks (#256)
c6a3c1ce Release 37.0 (#257)
e662bf49 Release 37.1 (#259)