games/minecraft-server: Update to 1.21.11
Changelog:
https://www.minecraft.net/en-us/article/minecraft-java-edition-1-21-11
PR: 291578
Approved by: Jonathan Price <freebsd@jonathanprice.org> (maintainer)
MFH: 2026Q1
(cherry picked from commit ad054d22c5b42a31f2eb855f94e98057488209c7)