Fixed: Update Tomcat to 9.0.74 (OFBIZ-12807)

Correct a regression in the fix for bug 66442 that meant that streams without a
response body did not decrement the active stream count when completing, leading
to ERR_HTTP2_SERVER_REFUSED_STREAM for some connections.

Along with lots of other bug fixes and improvements.

Please refer to the change log for the complete list of changes:
https://tomcat.apache.org/tomcat-9.0-doc/changelog.html

In OFBiz we also missed to update Tomcat in example build.grade
diff --git a/example/build.gradle b/example/build.gradle
index 5f4118b..5d4e331 100644
--- a/example/build.gradle
+++ b/example/build.gradle
@@ -22,7 +22,7 @@
 }
 
 dependencies {
-    pluginLibsCompile 'org.apache.tomcat.embed:tomcat-embed-websocket:9.0.69'
+    pluginLibsCompile 'org.apache.tomcat.embed:tomcat-embed-websocket:9.0.74'
 }
 
 node {