fix: ensure subclassed AugustApiAIOHTTPError is back-compat

[bdraco]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 37.50000% with 5 lines in your changes missing coverage. Please review.

Project coverage is 64.76%. Comparing base (e450a76) to head (39e2209).
Report is 2 commits behind head on main.

Files	Patch %	Lines
yalexs/manager/gateway.py	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #155      +/-   ##
==========================================
+ Coverage   64.75%   64.76%   +0.01%     
==========================================
  Files          29       29              
  Lines        2088     2089       +1     
  Branches      365      365              
==========================================
+ Hits         1352     1353       +1     
  Misses        685      685              
  Partials       51       51              

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