Fix Node 24 readline regression in updatedb.js

[unicomp23]

!!! DO NOT DELETE THIS PR/BRANCH !!!

Used by eureka until node24 gets fixed.

Replace for await loops on readline with event-based readline to avoid ERR_USE_AFTER_CLOSE error on Node 24.2+ when processing files with >1025 lines.

See: nodejs/node#60507

🤖 Generated with Claude Code

[exos]

What's happening with this PR? I have the same problem:

> node scripts/updatedb.js license_key=....

Checking  GeoLite2-Country-CSV.zip
Database country has new data
Fetching  GeoLite2-Country-CSV.zip
Retrieving GeoLite2-Country-CSV.zip ... DONE
Extracting GeoLite2-Country-CSV.zip ... DONE
Processing Lookup Data (may take a moment) ... DONE
Processing Data (may take a moment) ...
Still working (118173) ...
Still working (253149) ...
Still working (384757) ...
Still working (517931) ... DONE
Processing Data (may take a moment) ...
Still working (73597) ...
Still working (145994) ...
Still working (222856) ...
Still working (300673) ...
Still working (373217) ...
Still working (451923) ...
Still working (528623) ...
Still working (603725) ...node:internal/readline/interface:579
      throw new ERR_USE_AFTER_CLOSE('readline');
                 ^

Error [ERR_USE_AFTER_CLOSE]: readline was closed
    at Interface.resume (node:internal/readline/interface:579:13)
    at Object.next (node:events:1074:19)
    at processCountryData (/..../node_modules/geoip-lite/scripts/updatedb.js:432:17)
    at process.processTicksAndRejections (node:internal/process/task_queues:103:5) {
  code: 'ERR_USE_AFTER_CLOSE'
}

[bluesmoon]

@exos the original author deleted their branch before we could merge.