deps: update to sinon@18.0.1

[pichlermarc]

Which problem is this PR solving?

sinon is quite outdated and it's somewhat difficult to update due to some breaking changes, mostly around fake timers.
After attempting to update to latest multiple times, I've opted to increment major versions one-by-one to preserve my sanity.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.04%. Comparing base (3578f68) to head (e97d996).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5742   +/-   ##
=======================================
  Coverage   95.04%   95.04%           
=======================================
  Files         310      310           
  Lines        8013     8013           
  Branches     1620     1620           
=======================================
  Hits         7616     7616           
  Misses        397      397           

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[pichlermarc]

I think 18.01 is as far as I'm going to get for this PR. I'll pick up work on the 19 and 20 in other PRs.