fix issue 501 and issue 502 - mdibversion stateversion handling

[a-kleinf]

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have updated the changelog accordingly.
• I have added tests to cover my changes.

[codecov]

Codecov Report

❌ Patch coverage is 81.57895% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.42%. Comparing base (b6e59c0) to head (fafb1fb).

Files with missing lines	Patch %	Lines
src/sdc11073/mdib/clientmdib.py	75.90%	20 Missing ⚠️
src/sdc11073/mdib/devicemdib.py	96.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           v1.x.y     #504      +/-   ##
==========================================
- Coverage   86.23%   85.42%   -0.82%     
==========================================
  Files          65       65              
  Lines       11988    11943      -45     
==========================================
- Hits        10338    10202     -136     
- Misses       1650     1741      +91     

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