PreparedStatementCachingIT can fail for upstream version of the driver

https://argus.scylladb.com/tests/driver-matrix-tests/07866ff6-bfab-4abb-b87f-546ccefe2e00/tests
This is likely because of the issue with garbage collector removing elements from cache before the test can do it. Fix probably was not backported to all relevant versions and not solved in upstream yet.