SSDM-13366: Gradle wrapper to build the lib = jdk11

lib-microservice-server/build.gradle

 apply plugin: 'java-library'
 apply plugin: 'application'
 
+java {
+    toolchain {
+        languageVersion.set(JavaLanguageVersion.of(11))
+    }
+}
+
 repositories {
     ivy {
         ivyPattern "https://sissource.ethz.ch/openbis/openbis-public/openbis-ivy/-/raw/main/[organisation]/[module]/[revision]/ivy.xml"