Update bundled gems list as of 2025-12-24

Author: matzbot

gems/bundled_gems

@@ -9,7 +9,7 @@
 minitest            6.0.0  https://github.com/minitest/minitest
 power_assert        3.0.1   https://github.com/ruby/power_assert
 rake                13.3.1  https://github.com/ruby/rake
-test-unit           3.7.3   https://github.com/test-unit/test-unit
+test-unit           3.7.5   https://github.com/test-unit/test-unit
 rexml               3.4.4   https://github.com/ruby/rexml
 rss                 0.3.2   https://github.com/ruby/rss
 net-ftp             0.3.9   https://github.com/ruby/net-ftp