To support upcoming shibboleth version 5, we will need Tomcat 10+:
https://doku.tid.dfn.de/de:shibidp:upgrade5
SLES15SP4 currently offers Tomcat up to version 9.0.43
SuSE support has already issued a Feature Request (reference # PED-4586) for the inclusion of Tomcat 10 for SLE 15 SP4+, and the reader of these lines is encouraged to also contact SuSE to further the timely implementation.
Thank you, Tom