Upgrade CI to Java 15.0.1_9

Closes gh-23953

Author: philwebb

ci/images/get-jdk-url.sh

@@ -12,7 +12,7 @@ case "$1" in
 		 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%2B36/OpenJDK15U-jdk_x64_linux_hotspot_15_36.tar.gz"
+		 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"
 	;;
   *)
 		echo $"Unknown java version"