fix: log4shell-goof/log4shell-server/pom.xml to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JAVA-IOUNDERTOW-15053841
- https://snyk.io/vuln/SNYK-JAVA-IOUNDERTOW-14908846

Author: snyk-bot

log4shell-goof/log4shell-server/pom.xml

@@ -30,7 +30,7 @@
     <dependency>
       <groupId>io.undertow</groupId>
       <artifactId>undertow-core</artifactId>
-      <version>2.2.13.Final</version>
+      <version>2.3.21.Final</version>
     </dependency>
     <dependency>
       <groupId>commons-collections</groupId>