Upgrade Java 18 version in CI image

Closes gh-30488

Author: snicoll

ci/images/get-jdk-url.sh

@@ -12,7 +12,7 @@ case "$1" in
 		 echo "https://github.com/adoptium/temurin17-binaries/releases/download/jdk-17.0.2%2B8/OpenJDK17U-jdk_x64_linux_hotspot_17.0.2_8.tar.gz"
 	;;
 	java18)
-		 echo "https://github.com/adoptium/temurin18-binaries/releases/download/jdk18-2022-03-17-09-00-beta/OpenJDK18-jdk_x64_linux_hotspot_2022-03-17-09-00.tar.gz"
+		 echo "https://github.com/adoptium/temurin18-binaries/releases/download/jdk-18%2B36/OpenJDK18U-jdk_x64_linux_hotspot_18_36.tar.gz"
 	;;
   *)
 		echo $"Unknown java version"