Upgrade CI to JDK 21.0.1+12

Author: bclozel

ci/images/get-jdk-url.sh

@@ -6,7 +6,7 @@ case "$1" in
 		echo "https://download.bell-sw.com/java/17.0.9+11/bellsoft-jdk17.0.9+11-linux-amd64.tar.gz"
 	;;
 	java21)
-		echo "https://download.bell-sw.com/java/21+37/bellsoft-jdk21+37-linux-amd64.tar.gz"
+		echo "https://download.bell-sw.com/java/21.0.1+12/bellsoft-jdk21.0.1+12-linux-amd64.tar.gz"
 	;;
 	*)
 		echo $"Unknown java version"