www/tomcat9: update to 9.0.78

Changelog:
https://tomcat.apache.org/tomcat-9.0-doc/changelog.html#Tomcat_9.0.78_(remm)

Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D40960

(cherry picked from commit 1595d14911e55d7a8c9deb9771efd84220561bf6)