games/minecraft-server: Update 1.21.5 => 1.21.7

Changelogs:
https://www.minecraft.net/en-us/article/minecraft-java-edition-1-21-6
https://www.minecraft.net/en-us/article/minecraft-java-edition-1-21-7

PR: 287644
Approved by: Jonathan Price <freebsd@jonathanprice.org> (maintainer, timeout 3 weeks)
MFH: 2025Q3

(cherry picked from commit ff79bdca19feda09958a1e65022f36dc75914fc2)