Bump undertow to v2.2.40

Author: patrikk0123

pom.xml

@@ -42,7 +42,7 @@
     <projectOwner>Red Hat, Inc.</projectOwner>
     <projectEmail>https://github.com/Commonjava/http-testserver</projectEmail>
     <javaVersion>11</javaVersion>
-    <undertowVersion>2.2.38.Final</undertowVersion>
+    <undertowVersion>2.2.40.Final</undertowVersion>
     <slf4j.versoin>1.7.36</slf4j.versoin>
   </properties>