[DOC] Fix a link in NEWS.md

Author: znz

NEWS.md

@@ -335,6 +335,7 @@ A lot of work has gone into making Ractors more stable, performant, and usable.
 [Feature #21219]: https://bugs.ruby-lang.org/issues/21219
 [Feature #21258]: https://bugs.ruby-lang.org/issues/21258
 [Feature #21262]: https://bugs.ruby-lang.org/issues/21262
+[Feature #21275]: https://bugs.ruby-lang.org/issues/21275
 [Feature #21287]: https://bugs.ruby-lang.org/issues/21287
 [Feature #21347]: https://bugs.ruby-lang.org/issues/21347
 [Feature #21360]: https://bugs.ruby-lang.org/issues/21360