Fix semaphore extra release.

[EricSites]

Thank you for submitting this pull request! We appreciate you spending the time to work on these changes.

What is the motivation?

Fix this bug: #185

What does this change do?

Fixes extra semaphore release when connection is canceled.

What is your testing strategy?

Large system using SurrealDB on TiVK.

Is this related to any issues?

semaphore

Have you read the Contributing Guidelines?

• I have read the Contributing Guidelines

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.17%. Comparing base (6fd2105) to head (b33f878).
Report is 55 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #186      +/-   ##
==========================================
+ Coverage   69.65%   73.17%   +3.52%     
==========================================
  Files         161      180      +19     
  Lines        6702     7369     +667     
  Branches      775      764      -11     
==========================================
+ Hits         4668     5392     +724     
+ Misses       1689     1672      -17     
+ Partials      345      305      -40     

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