chore(deps): update dependency javax.servlet:javax.servlet-api to v4 (#229)

Author: renovate-bot

invoker/core/pom.xml

@@ -49,7 +49,7 @@
     <dependency>
       <groupId>javax.servlet</groupId>
       <artifactId>javax.servlet-api</artifactId>
-      <version>3.1.0</version>
+      <version>4.0.1</version>
     </dependency>
     <dependency>
       <groupId>io.cloudevents</groupId>