Fix the _task_input_resolver

[superstar54]

_default_input_resolver should only consider links where the socket is the to_socket

[codecov]

Codecov Report

❌ Patch coverage is 81.81818% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.45%. Comparing base (7236f46) to head (3f6528e).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/node_graph/task.py	33.33%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #138   +/-   ##
=======================================
  Coverage   90.45%   90.45%           
=======================================
  Files          79       79           
  Lines        8126     8134    +8     
=======================================
+ Hits         7350     7358    +8     
  Misses        776      776           

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