Fixes the import path for the Attribute class

[wvandeun]

In #409 we have split up the node.py file into multiple files.
This created an issue with the import path of the Attribute class.

[wvandeun]

Related to opsmill/infrahub-ansible#228

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

@@           Coverage Diff           @@
##           stable     #448   +/-   ##
=======================================
  Coverage   75.57%   75.57%           
=======================================
  Files         100      100           
  Lines        8750     8751    +1     
  Branches     1704     1704           
=======================================
+ Hits         6613     6614    +1     
  Misses       1661     1661           
  Partials      476      476           

Flag	Coverage Δ
integration-tests	34.63% <0.00%> (-0.01%)	⬇️
python-3.10	47.84% <0.00%> (-0.03%)	⬇️
python-3.11	47.84% <0.00%> (-0.03%)	⬇️
python-3.12	47.84% <0.00%> (-0.01%)	⬇️
python-3.13	47.82% <0.00%> (-0.03%)	⬇️
python-3.9	46.51% <0.00%> (-0.03%)	⬇️
python-filler-3.12	25.28% <100.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
infrahub_sdk/node/__init__.py	100.00% <100.00%> (ø)

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