Replace unmaintained uid-number package with passwd-user.

[dlongley]

I would also like to update the serialize-error package. It has a new major version with this changelog that I don't expect to affect us:

https://github.com/sindresorhus/serialize-error/releases/tag/v11.0.0

@mattcollier, please let me know if you think I can roll that update in.

EDIT: I manually tested the new username => UID code path here. We don't have a good built-in test for this -- and I'm not sure how to write one that will work across systems either (not taking on figuring that out either at the moment).

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.43%. Comparing base (099a22a) to head (9ecc9a3).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
lib/loggers/fileLogger.js	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #124      +/-   ##
==========================================
- Coverage   81.45%   81.43%   -0.02%     
==========================================
  Files          10       10              
  Lines        1941     1939       -2     
==========================================
- Hits         1581     1579       -2     
  Misses        360      360              

Files with missing lines	Coverage Δ
lib/loggers/fileLogger.js	82.14% <50.00%> (-0.32%)	⬇️

---

Continue to review full report in Codecov by Sentry.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 099a22a...9ecc9a3. Read the comment docs.