Refactor version retrieval in ParkingStockholm class

[klaasnicolaas]

Proposed change

Additional information

• This PR fixes or closes issue: fixes #

Checklist

• I have updated the documentation if needed.
• I have updated the tests if needed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (1352ffc) to head (74a45f7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #354   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files            4         4           
  Lines           77        77           
  Branches         3         3           
=========================================
  Hits            77        77           

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