Log Message:
textproc/ruby-kramdown-rfc2629: update to 1.7.13

1.7.12 (2024-05-18)

* Add kramdown-rfc-lsr

1.7.13 (2024-05-18)

More heroics to get info about targets of section references

* Requires xml2rfc and tidy commands in path for these heroics to work best
* Use without open-uri-cached is untested (gem install open-uri-cached)