Bump org.apache.tomcat.maven:tomcat6-maven-plugin from 2.0 to 2.2

Bumps org.apache.tomcat.maven:tomcat6-maven-plugin from 2.0 to 2.2.

---
updated-dependencies:
- dependency-name: org.apache.tomcat.maven:tomcat6-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

blueprint/examples/blueprint-sample-war/pom.xml

@@ -51,7 +51,7 @@
         <geronimo-servlet_2.5_spec.version>1.2</geronimo-servlet_2.5_spec.version>
         <jetty-maven-plugin.version>8.1.16.v20140903</jetty-maven-plugin.version>
         <maven-war-plugin.version>3.4.0</maven-war-plugin.version>
-        <tomcat6-maven-plugin.version>2.0</tomcat6-maven-plugin.version>
+        <tomcat6-maven-plugin.version>2.2</tomcat6-maven-plugin.version>
         <tomcat7-maven-plugin.version>2.0</tomcat7-maven-plugin.version>
     </properties>