ScyllaDB release: version 1.6.2

ScyllaDB 1.6.2 is a bugfix release for the ScyllaDB 1.6 stable branch, offering backward compatibility and support for rolling upgrades. Users upgrading from version 1.5.x are advised to review the 1.6 release notes due to changes in some metrics. The release addresses several issues, including errors during sstable flushes that could cause ScyllaDB to exit, problems with authentication settings affecting the system_auth keyspace, and potential memory allocation failures during scanning and flush operations, particularly when running with cache disabled. Additionally, it resolves streaming failures with compressed files and unexpected exits during the repair process. Users are encouraged to report any problems encountered.