fix: replace deprecated SOURCE_TYPE_GPS with SourceType.GPS

[andreasbrett]

fixes #364

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.20%. Comparing base (7745671) to head (9b5b00c).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #365   +/-   ##
=======================================
  Coverage   98.20%   98.20%           
=======================================
  Files          20       20           
  Lines         668      668           
=======================================
  Hits          656      656           
  Misses         12       12           

Flag	Coverage Δ
unittests	98.20% <100.00%> (ø)

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