Make time injectable to fix a flaky test

[mengelbart]

Fixes #451

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.47%. Comparing base (3783f4d) to head (26c7984).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #459      +/-   ##
==========================================
+ Coverage   81.37%   81.47%   +0.09%     
==========================================
  Files          89       90       +1     
  Lines        4650     4664      +14     
==========================================
+ Hits         3784     3800      +16     
+ Misses        687      686       -1     
+ Partials      179      178       -1     

Flag	Coverage Δ
go	81.47% <100.00%> (+0.09%)	⬆️

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