Log Message:
textproc/ruby-kramdown-rfc2629: update to 1.4.13

Qoute from commit logs:

1.4.13 (2021-05-21)

* Emergency fix for psych 4.0.0

1.4.12 (2021-05-13)

* Add boilerplates bcp14info (and bcp14info-tagged)
  "info" adds disclaimer suggested by Adrian Farrel.

1.4.11 (2021-05-08)

* Add limited support for railroad diagrams (via kgt)

1.4.10 (2021-05-05)

* Handle link text with !?-, fix backslashes

1.4.9 (2021-05-04)

* Allow !?- in section references

1.4.8 (2021-05-04)

* Handle Sections+Appendices, enable (markdown) text in xref

1.4.7 (2021-05-03)

* add kramdown-rfc-cache-subseries-bibxml

1.4.6 (2021-04-29)

* fix NOT RECOMMENDED
* Add {::boilerplate bcp14-tagged}
* Fix missing encoding fallback for nbsp (U+00A0)

1.4.5 (2021-04-29)

* doilit: add issue numbers (crossref style)

1.4.4 (2021-04-29)

*  Add refcontent

1.4.3 (2021-04-19)

* Fix mscgen regression caused by svgcheck -N

1.4.2 (2021-04-06)

* kdrfc supports -P for PDF generation

1.4.1 (2021-03-22)

* Update to current upstream kramdown ~> 2.3.1
  Reimplement XML processing instruction support that was removed from
  upstream.