Remove deleted repo from extensions list

[autogestion]

https://github.com/Sniedes722/Sanic-OAuth (Sanic-OAuth: OAuth Library for connecting to & creating your own token providers.) returns 404

[codecov]

Codecov Report

Merging #1487 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1487      +/-   ##
==========================================
- Coverage   91.45%   91.39%   -0.06%     
==========================================
  Files          17       17              
  Lines        1731     1731              
  Branches      330      330              
==========================================
- Hits         1583     1582       -1     
  Misses        123      123              
- Partials       25       26       +1

Impacted Files	Coverage Δ
sanic/router.py	95.43% <0%> (-0.46%)	⬇️

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