Remove reference to java14 in CI scripts

Closes gh-24472

Author: snicoll

ci/images/get-jdk-url.sh

@@ -8,9 +8,6 @@ case "$1" in
 	java11)
 		 echo "https://github.com/AdoptOpenJDK/openjdk11-binaries/releases/download/jdk-11.0.9.1%2B1/OpenJDK11U-jdk_x64_linux_hotspot_11.0.9.1_1.tar.gz"
 	;;
-	java14)
-		 echo "https://github.com/AdoptOpenJDK/openjdk14-binaries/releases/download/jdk-14.0.2%2B12/OpenJDK14U-jdk_x64_linux_hotspot_14.0.2_12.tar.gz"
-	;;
 	java15)
 		 echo "https://github.com/AdoptOpenJDK/openjdk15-binaries/releases/download/jdk-15.0.1%2B9/OpenJDK15U-jdk_x64_linux_hotspot_15.0.1_9.tar.gz"
 	;;