chore: update oxigraph

[NilsOveTen]

resolve #92

Etter som jeg fant så har ikke oxigraph implementert noen form for isomorphic-sjekk, så drar det inn fra sophia som dev-dependency for bruk i testene

[codecov]

Codecov Report

Attention: Patch coverage is 57.14286% with 6 lines in your changes missing coverage. Please review.

Project coverage is 10.33%. Comparing base (2023d07) to head (79c85c3).

Files with missing lines	Patch %	Lines
src/graph.rs	54.54%	1 Missing and 4 partials ⚠️
tests/integration_test.rs	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #93      +/-   ##
==========================================
- Coverage   10.46%   10.33%   -0.13%     
==========================================
  Files          10        9       -1     
  Lines        4272     4248      -24     
  Branches      877      871       -6     
==========================================
- Hits          447      439       -8     
+ Misses       3654     3632      -22     
- Partials      171      177       +6     

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