Remove upper level version dependency for oteapi-core

[CasperWA]

Fixes #61 by fixing the expected OpenAPI (JSON) schema in the relevant test.

Fixes SemanticMatter/DataSpaces-Services#25 by removing the upper limit for the oteapi-core dependency.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.64%. Comparing base (56470b0) to head (7fed3c5).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #62   +/-   ##
=======================================
  Coverage   79.64%   79.64%           
=======================================
  Files          14       14           
  Lines         899      899           
=======================================
  Hits          716      716           
  Misses        183      183           

Flag	Coverage Δ
pytest	79.64% <ø> (ø)

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[CasperWA]

@quaat and @Treesarj I will force merge this PR as they are very minor fixes - if issues arise I will make sure to create issues here describing them.