Remove Cassandra 3 pipeline properties.

We're building against Cassandra 5 using Testcontainers.

See #2493

Author: mp911de

ci/pipeline.properties

@@ -15,9 +15,6 @@ docker.mongodb.8.0.version=8.0.0
 docker.redis.6.version=6.2.13
 docker.redis.7.version=7.2.4
 
-# Supported versions of Cassandra
-docker.cassandra.3.version=3.11.16
-
 # Docker environment settings
 docker.java.inside.basic=-v $HOME:/tmp/jenkins-home
 docker.java.inside.docker=-u root -v /var/run/docker.sock:/var/run/docker.sock -v /usr/bin/docker:/usr/bin/docker -v $HOME:/tmp/jenkins-home