Remove unused dependencies

[Celebrate-future]

@welk1n Hi, I am a user of project welk1n:JNDI-Injection-Exploit:1.0-SNAPSHOT. I found that its pom file introduced 28 dependencies. However, among them, 4 libraries (14%) have not been used by your project (the redundant dependencies are listed below). This PR helps welk1n:JNDI-Injection-Exploit:1.0-SNAPSHOT lose weight :) I have tested the revised configuration in my local environment. It is safe to remove the unused libraries.

Best regards

Redundant dependencies----

org.apache.tomcat:tomcat-jaspic-api:jar:8.5.38:compile
org.apache.tomcat:tomcat-el-api:jar:8.5.38:compile
org.eclipse.jetty.orbit:javax.servlet:jar:3.0.0.v201112011016:compile
org.apache.tomcat:tomcat-jsp-api:jar:8.5.38:compile