Bump groovy from 2.3.11 to 2.4.21 in /generators/site-tomee-ng

Bumps [groovy](https://github.com/apache/groovy) from 2.3.11 to 2.4.21.
- [Release notes](https://github.com/apache/groovy/releases)
- [Commits](https://github.com/apache/groovy/commits)

---
updated-dependencies:
- dependency-name: org.codehaus.groovy:groovy
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
1 file changed
tree: b48bc80fb544704e0a2019bbfd53004d85c13885
  1. cgi-bin/
  2. content/
  3. generators/
  4. lib/
  5. templates/
  6. README.adoc