fix: todolist-goof/Dockerfile to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-DEBIAN9-FREETYPE-1019584
- https://snyk.io/vuln/SNYK-DEBIAN9-GLIBC-356506
- https://snyk.io/vuln/SNYK-DEBIAN9-INETUTILS-564742
- https://snyk.io/vuln/SNYK-DEBIAN9-SQLITE3-307593
- https://snyk.io/vuln/SNYK-DEBIAN9-WGET-300458

todolist-goof/Dockerfile

@@ -10,7 +10,7 @@ COPY todolist-web-common todolist-web-common
 COPY todolist-web-struts todolist-web-struts
 RUN --mount=target=$HOME/.m2,type=cache mvn install
 
-FROM tomcat:8.5.21
+FROM tomcat:8
 
 RUN mkdir /tmp/extracted_files
 COPY web.xml /usr/local/tomcat/conf/web.xml