feat(tomcat 9): no need to pull tomcat-dbcp anymore (#370)

as the tomcat 9 pulled version is the right one now

Relates to [RUNTIME-434](https://bonitasoft.atlassian.net/browse/RUNTIME-434)

tomcat-resources/tomcat-jta/pom.xml

@@ -36,6 +36,7 @@
             <groupId>org.apache.tomcat</groupId>
             <artifactId>tomcat-dbcp</artifactId>
             <version>${version.org.apache.tomcat}</version>
+            <scope>provided</scope>
             <exclusions>
                 <exclusion>
                     <groupId>org.apache.tomcat</groupId>