New upstream version 2.4.11

.github/ISSUE_TEMPLATE/bug_report.md

.github/workflows/python.yaml

CHANGES.md

CONTRIBUTORS.txt

README.md

TODO.txt

bin/markdown2

lib/markdown2.py

perf/gen_perf_cases.py

perf/perf.py

perf/strip_cookbook_data.py

perf/util.py

sandbox/wiki.py

setup.py

test/markdown.py

test/markdowntest-cases/Auto links.html

test/php-markdown-cases/Links, inline style.html

test/test.py

test/test_markdown2.py

test/testall.py