Java: Add missing metadata.

Author: aschackmull

java/ql/src/experimental/Security/CWE/CWE-016/InsecureSpringActuatorConfig.ql

@@ -3,6 +3,8 @@
  * @description Exposed Spring Boot Actuator through configuration files without declarative or procedural
  *              security enforcement leads to information leak or even remote code execution.
  * @kind problem
+ * @problem.severity error
+ * @precision high
  * @id java/insecure-spring-actuator-config
  * @tags security
  *       external/cwe-016