Fixed freeze script github yaml parsing and unfroze the ci versions

[reinecke]

The freeze CI versions script had broken with an update to the GitHub documentation formatting. This update uses a slightly more markdown-aware approach to extract the needed info.

Also addressed minor escaping issue in Makefile I'd discovered while cutting the 0.16.0 release.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 81.71%. Comparing base (c0e97b0) to head (62e7a4e). Report is 15 commits behind head on main.

Additional details and impacted files

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