Fix typo in warning message when non allowlisted plugins found

[hdkiller]

Background

There is a typo in the warning message when Auto-GPT tries to load a plugin which is not allowlisted.

Changes

Replace WARNNG to WARNING to be consistent with the other messages.

Documentation

N/A

Test Plan

I've checked if the application shows WARNING: instead of WARNNG when a not whitelisted plugin found.

PR Quality Checklist

• My pull request is atomic and focuses on a single change.
• I have thoroughly tested my changes with multiple different prompts.
• I have considered potential risks and mitigations for my changes.
• I have documented my changes clearly and comprehensively.
• I have not snuck in any "extra" small tweaks changes

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -6.38 ⚠️

Comparison is base (da48f9c) 45.81% compared to head (364ab62) 39.44%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3044      +/-   ##
==========================================
- Coverage   45.81%   39.44%   -6.38%     
==========================================
  Files          60       60              
  Lines        2918     2918              
  Branches      480      480              
==========================================
- Hits         1337     1151     -186     
- Misses       1472     1692     +220     
+ Partials      109       75      -34     

Impacted Files	Coverage Δ
autogpt/plugins.py	73.88% <ø> (ø)

... and 16 files with indirect coverage changes

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