databases/rocksdb: Update to 8.5.3

• Install librocksdb_test.so: it is required by table_reader_bench

(rocksdb-8.5.3) /wrkdirs/usr/ports/databases/rocksdb/work/stage//usr/local/bin/table_reader_bench - required shared library librocksdb_test.so not found

Changes: https://github.com/facebook/rocksdb/releases