Replace Unsupported Python Version Number from the Contributing Doc

[ChihweiLHBird]

No description provided.

[codecov]

Codecov Report

Merging #2505 (145e065) into main (8f6c87c) will increase coverage by 0.054%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##              main     #2505       +/-   ##
=============================================
+ Coverage   87.342%   87.396%   +0.054%     
=============================================
  Files           69        69               
  Lines         5554      5554               
  Branches       966       966               
=============================================
+ Hits          4851      4854        +3     
+ Misses         510       508        -2     
+ Partials       193       192        -1     

Impacted Files	Coverage Δ
sanic/server/protocols/http_protocol.py	83.823% <0.000%> (+2.205%)	⬆️

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