Fix deprecated calls syntax to Triplestore.triples()

[jesper-friis]

The triples() method has been changed from taking a (s,p,o) tuple as argument to taking optional subject, predicate, object arguments.

This PR updates calls to triples() accordingly.

[codecov-commenter]

Codecov Report

Base: 67.07% // Head: 67.16% // Increases project coverage by +0.09% 🎉

Coverage data is based on head (000c2c1) compared to base (13c64ee).
Patch coverage: 57.14% of modified lines in pull request are covered.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
+ Coverage   67.07%   67.16%   +0.09%     
==========================================
  Files          14       14              
  Lines        1063     1063              
==========================================
+ Hits          713      714       +1     
+ Misses        350      349       -1     

Impacted Files	Coverage Δ
tripper/triplestore.py	78.62% <57.14%> (+0.36%)	⬆️

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