textproc/ruby-kramdown-rfc2629: update to 1.6.37

1.6.36 (2023-06-27)

* use "-m" option with utftex (no special subscript characters)
  As per bartp5/libtexprintf#23

1.6.37 (2023-07-06)

* DOIs: experimental extractor for "ACM DOIs"
  Don't hide publisher when there is a container-title.
  DOI: put publisher into refcontent
  doilit: add command line option for dx.doi.org site

(taca)