Update mcp version to 1.6.0 to avoid bug in closing client.

[ekzhu]

Upgrade mcp package version to >=1.6.0 to avoid bugs causing hanging when using mcp_server_featch.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.08%. Comparing base (c620683) to head (972bb4d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6162   +/-   ##
=======================================
  Coverage   77.08%   77.08%           
=======================================
  Files         197      197           
  Lines       13637    13637           
=======================================
  Hits        10512    10512           
  Misses       3125     3125           

Flag	Coverage Δ
unittests	77.08% <ø> (ø)

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