Servlet 5.0 support

I am using keycloak-saml-servlet-filter-adapter.

I would like to run the module with Tomcat 10, that uses Servlet 5.0 and Jakarta EE 9.

Java 17 will drop support for older javax.* namespaced libraries from Jakarta EE 8 and earlier.

The source code of keycloak dependes on
jboss-servlet-api_3.0_spec or jboss-servlet-api_4.0_spec which is incompatible with Tomcat.