Freeze cmarkgfm and fix MANIFEST.in

Author: mkrnr

MANIFEST.in

@@ -33,6 +33,7 @@ include test/*.py
 include test/gui_qt/*.py
 include tox.ini
 include windows/*
+exclude dev/*
 exclude .pre-commit-config.yaml
 # without first including it, exluding .readthedocs.yml results in a warning when running locally
 include .readthedocs.yml

reqs/constraints.txt

@@ -12,6 +12,7 @@ charset-normalizer==3.4.1
 check-manifest==0.50
 click==8.1.8
 click-default-group==1.2.4
+cmarkgfm==2024.11.20
 colorama==0.4.6
 cryptography==44.0.2
 dmgbuild==1.6.5