Fix serialisation of dict

[GavinMendelGleason]

Please read https://github.com/terminusdb/terminusdb-client-python/blob/main/CONTRIBUTING.md
before submitting a pull request.

[codecov]

Codecov Report

Merging #422 (358b184) into main (0251f80) will increase coverage by 0.39%.
The diff coverage is 91.30%.

@@            Coverage Diff             @@
##             main     #422      +/-   ##
==========================================
+ Coverage   79.12%   79.51%   +0.39%     
==========================================
  Files          62       62              
  Lines        5730     5742      +12     
==========================================
+ Hits         4534     4566      +32     
+ Misses       1196     1176      -20     

Files	Coverage Δ
terminusdb_client/schema/schema.py	79.20% <100.00%> (ø)
terminusdb_client/scripts/scripts.py	87.58% <100.00%> (ø)
terminusdb_client/tests/test_woqlQuery.py	100.00% <100.00%> (ø)
terminusdb_client/woqlquery/woql_core.py	92.42% <100.00%> (+0.11%)	⬆️
terminusdb_client/woqlquery/woql_query.py	53.81% <80.00%> (+1.56%)	⬆️

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