Update to javax.servlet.jsp.jstl-api:1.2.2

Fixes gh-5820

gradle/javaprojects.gradle

@@ -24,7 +24,7 @@ ext.hibernateValidatorVersion = '5.3.6.Final'
 ext.jacksonDatabindVersion = '2.8.11.2'
 ext.javaPersistenceVersion = '2.1.1'
 ext.jettyVersion = '6.1.26'
-ext.jstlVersion = '1.2.1'
+ext.jstlVersion = '1.2.2'
 ext.junitVersion = '4.12'
 ext.logbackVersion = '1.1.11'
 ext.powerMockVersion = '1.6.2'