ref: fix typing for sentry.tasks.process_buffer

[asottile-sentry]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:white_check_mark: All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master   #78644   +/-   ##
=======================================
  Coverage   78.13%   78.13%           
=======================================
  Files        7101     7101           
  Lines      312838   312838           
  Branches    51089    51089           
=======================================
  Hits       244422   244422           
- Misses      62039    62043    +4     
+ Partials     6377     6373    -4     

[sentry[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TimeoutError: Timeout reading from socket sentry.tasks.process_buffer.process_incr View Issue
• ‼️ TimeoutError: Timeout reading from socket sentry.tasks.process_buffer.process_incr View Issue
• ‼️ Release.DoesNotExist: Release matching query does not exist. sentry.tasks.process_buffer.process_incr View Issue
• ‼️ OperationalError: OperationalError('server closed the connection unexpectedly\n\tThis probably means the server ter... sentry.tasks.process_buffer.process_incr View Issue

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