Update keycloak.version to v20

pom.xml

@@ -16,7 +16,7 @@
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <maven.compiler.source>1.8</maven.compiler.source>
     <maven.compiler.target>1.8</maven.compiler.target>
-    <keycloak.version>7.0.0</keycloak.version>
+    <keycloak.version>20.0.3</keycloak.version>
     <jboss-transaction-api_1.2_spec>1.1.1.Final</jboss-transaction-api_1.2_spec>
     <resteasy.version>3.6.1.Final</resteasy.version>
     <bouncycastle.version>1.60</bouncycastle.version>