[Fix] Use runtime Hyperscan version instead of compile-time version for database...

[Fix] Use runtime Hyperscan version instead of compile-time version for database validation

The issue was that the database version check used HS_DB_VERSION macro defined
in headers at compile time, while Hyperscan .so library writes the version from
its own headers. When the system updates the Hyperscan package but Rspamd isn't
recompiled, this causes a version mismatch and database validation fails.

The fix calls hs_version() at runtime to get the actual library version and uses
that for validation instead. This ensures compatibility when the Hyperscan library
is updated independently.