Fix relative imports for Python checks

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 21.05263% with 15 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
infrahub_sdk/ctl/check.py	20.00%	8 Missing :warning:
infrahub_sdk/schema.py	22.22%	7 Missing :warning:

@@             Coverage Diff             @@
##           develop     #131      +/-   ##
===========================================
+ Coverage    65.38%   65.42%   +0.03%     
===========================================
  Files           76       76              
  Lines         6922     6918       -4     
  Branches      1368     1366       -2     
===========================================
  Hits          4526     4526              
+ Misses        2027     2023       -4     
  Partials       369      369              

Flag	Coverage Δ
python-3.10	44.43% <10.52%> (-0.01%)	:arrow_down:
python-3.11	44.43% <10.52%> (-0.01%)	:arrow_down:
python-3.12	44.43% <10.52%> (-0.01%)	:arrow_down:
python-3.9	43.55% <10.52%> (-0.01%)	:arrow_down:
python-filler-3.12	23.83% <10.52%> (+0.04%)	:arrow_up:

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Files with missing lines	Coverage Δ
infrahub_sdk/schema.py	73.52% <22.22%> (-0.87%)	:arrow_down:
infrahub_sdk/ctl/check.py	28.22% <20.00%> (+1.21%)	:arrow_up: