modify path in proto.mk to fix jeremyje/coretemp-exporter#90

[nukopal]

Hi @jeremyje ,
This pull request addresses the #90, where the Makefile paths were not updating correctly with changes to dependencies. I have modified the Makefile to ensure that the paths are updated appropriately.

Applying this change, the build for all targets finished successfully. I have attached the log here.
build_2024-02-20_01-11-00.log

If there are any problems, please feel free to correct them.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9d3e671) 36.32% compared to head (6662026) 36.32%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #91   +/-   ##
=======================================
  Coverage   36.32%   36.32%           
=======================================
  Files          15       15           
  Lines         534      534           
=======================================
  Hits          194      194           
  Misses        320      320           
  Partials       20       20           

Flag	Coverage Δ
unittests	36.32% <ø> (ø)

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