fix: keep MQTT network loop alive on disconnect

[bibbyee]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 78.26087% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.99%. Comparing base (9ff60ed) to head (916303e).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/libdeye/mqtt_client.py	78.26%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #68      +/-   ##
==========================================
- Coverage   93.40%   92.99%   -0.41%     
==========================================
  Files           7        7              
  Lines         849      871      +22     
  Branches       88       90       +2     
==========================================
+ Hits          793      810      +17     
- Misses         25       29       +4     
- Partials       31       32       +1     

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