Remove JDK-19 support from updatecli script (#1836)

Java 19 was never supported by Jenkins. Java 19 support from the OpenJDK
project ended 21 Mar 2023.  We do not need to define the download URL
for a Java version that is not supported by Jenkins.

updatecli/scripts/check-jdk.sh

@@ -25,10 +25,6 @@ function get_jdk_download_url() {
       ## JDK17 URLs have an underscore ('_') instead of a plus ('+') in their archive names
       echo "https://github.com/adoptium/temurin17-binaries/releases/download/jdk-${jdk_version}/OpenJDK17U-jdk_${platform}_hotspot_${jdk_version//+/_}";
       return 0;;
-    19*)
-      ## JDK19 URLs have an underscore ('_') instead of a plus ('+') in their archive names
-      echo "https://github.com/adoptium/temurin19-binaries/releases/download/jdk-${jdk_version}/OpenJDK19U-jdk_${platform}_hotspot_${jdk_version//+/_}";
-      return 0;;
     21*)
       ## JDK21 URLs have an underscore ('_') instead of a plus ('+') in their archive names
       echo "https://github.com/adoptium/temurin21-binaries/releases/download/jdk-${jdk_version}/OpenJDK21U-jdk_${platform}_hotspot_${jdk_version//+/_}";
@@ -47,8 +43,6 @@ case "${1}" in
     platforms=("x64_linux" "x64_windows" "aarch64_linux" "s390x_linux");;
   17.*+*)
     platforms=("x64_linux" "x64_windows" "aarch64_linux" "s390x_linux");;
-  19.*+*)
-    platforms=("x64_linux" "x64_windows" "aarch64_linux" "s390x_linux");;
   21*+*)
     platforms=("x64_linux" "x64_windows" "aarch64_linux");;
   *)