fix(deps): update dependency net.kyori:adventure-text-minimessage to v4.21.0

Author: renovate[bot]

PistonChat/build.gradle.kts

@@ -14,7 +14,7 @@ dependencies {
     implementation("com.github.technicallycoded:FoliaLib:main-SNAPSHOT")
     implementation("com.google.code.gson:gson:2.13.1")
     implementation("net.kyori:adventure-platform-bukkit:4.3.4")
-    implementation("net.kyori:adventure-text-minimessage:4.20.0")
+    implementation("net.kyori:adventure-text-minimessage:4.21.0")
     implementation("org.bstats:bstats-bukkit:3.1.0")
     implementation("org.mariadb.jdbc:mariadb-java-client:3.5.3")
     implementation("com.github.ben-manes.caffeine:caffeine:3.2.0")