Use UID/GID range that doesn't overlap with the range used by Debian

[adombeck]

See https://www.debian.org/doc/debian-policy/ch-opersys.html#uid-and-gid-classes

Closes #547
UDENG-4689

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.75%. Comparing base (e7e07f2) to head (ce36b18).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #548   +/-   ##
=======================================
  Coverage   84.75%   84.75%           
=======================================
  Files          79       79           
  Lines        6953     6955    +2     
  Branches       75       75           
=======================================
+ Hits         5893     5895    +2     
- Misses        740      741    +1     
+ Partials      320      319    -1     

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[didrocks]

This one is really easy, let’s get with it :)