Bump tomcat-jdbc from 9.0.17 to 9.0.19 in /modules/mysql (#1401)

Bumps tomcat-jdbc from 9.0.17 to 9.0.19.

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modules/mysql/build.gradle

@@ -5,7 +5,7 @@ dependencies {
 
     testCompile 'mysql:mysql-connector-java:8.0.14'
     testCompile 'com.zaxxer:HikariCP-java6:2.3.13'
-    testCompile 'org.apache.tomcat:tomcat-jdbc:9.0.17'
+    testCompile 'org.apache.tomcat:tomcat-jdbc:9.0.19'
     testCompile 'commons-dbutils:commons-dbutils:1.7'
     testCompile 'org.vibur:vibur-dbcp:22.2'
 }