main: Update Quarkus Platform and Group to v3.21.1 (#1291)

Author: renovate-bot

gradle/libs.versions.toml

@@ -20,7 +20,7 @@
 [versions]
 hadoop = "3.4.1"
 iceberg = "1.8.1" # Ensure to update the iceberg version in regtests to keep regtests up-to-date
-quarkus = "3.19.4"
+quarkus = "3.21.1"
 immutables = "2.10.1"
 picocli = "4.7.6"
 scala212 = "2.12.19"