Log Message:
textproc/ruby-kramdown-rfc2629: update to 1.6.22

1.6.21 (2023-01-19)

* iref-xref-swap Swap the order of <xref...><iref...>

  Rewrite the ttcol dexmlifier to be robust against this change.

1.6.22 (2023-01-30)

* Switch from asciitex to utftex

  Automatic fallback to asciitex Manual fallback with "math-asciitex"