[#2030] Upgrade Db2 JDBC driver to 12.1.0.0

Author: DavideD

hibernate-reactive-core/build.gradle

@@ -58,7 +58,7 @@ dependencies {
     testRuntimeOnly "com.mysql:mysql-connector-j:8.0.33"
 
     // JDBC driver for Db2 server, for testing
-    testRuntimeOnly "com.ibm.db2:jcc:11.5.9.0"
+    testRuntimeOnly "com.ibm.db2:jcc:12.1.0.0"
 
     // EHCache
     testRuntimeOnly ("org.ehcache:ehcache:3.10.8") {