Force socket shutdown before close

[ahopkins]

From a discussion on Discord, multi-process mode does not allow sockets to be rebound. Forcing socket shutdown from the main upon cleanup seems to solve this as shown here:

[codecov]

Codecov Report

Base: 87.864% // Head: 87.866% // Increases project coverage by +0.002% 🎉

Coverage data is based on head (bb0e6f3) compared to base (4c14910).
Patch coverage: 100.000% of modified lines in pull request are covered.

Additional details and impacted files

@@              Coverage Diff              @@
##              main     #2607       +/-   ##
=============================================
+ Coverage   87.864%   87.866%   +0.002%     
=============================================
  Files           71        71               
  Lines         5356      5357        +1     
  Branches       893       893               
=============================================
+ Hits          4706      4707        +1     
  Misses         471       471               
  Partials       179       179               

Impacted Files	Coverage Δ
sanic/mixins/startup.py	91.916% <100.000%> (+0.018%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.