Contains all version related information (`nodetool version` and more).
Example printout:
(cqlsh) select * from system.versions;
key | build_id | build_mode | version
-------+------------------------------------------+------------+-------------------------------
local | aaecce2f5068b0160efd04a09b0e28e100b9cd9e | dev | 4.6.dev-0.20211021.0d744fd3fa