Log Message:
textproc/ruby-yard: update to 0.9.25

Update ruby-yard to 0.9.25.

# 0.9.25 - May 3rd, 2020

[0.9.25]: https://github.com/lsegal/yard/compare/v0.9.24...v0.9.25

- Fix parsing issue with conditional blocks mixed with conditional modifiers.
  (#1308, #1324, #1326, #1327)
- Add table of contents IDs to redcarpet generated markdown. (#1323)
- Backport fixes for Ruby 1.9 (#1320)
- Fix parsing of checksums in yard server (#1301)
- Map Ruby C variable error names to Ruby classes (#1270, #1275)
- Fix initialization of RDocMarkup across threads (#1318)
- Remove warning for Kernel#open (#1312)
- Omit spec files in gem package (#1307)
- README updates (#1322)