don't dispose the blocking collection when cancelling

[adamhathcock]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 95.65217% with 1 line in your changes missing coverage. Please review.

Project coverage is 70.67%. Comparing base (7329155) to head (62c9f77).
Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
...c/Speckle.Sdk/Api/Operations/Operations.Receive.cs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              dev     #222       +/-   ##
===========================================
+ Coverage   59.42%   70.67%   +11.25%     
===========================================
  Files         262      278       +16     
  Lines       10412    11135      +723     
  Branches     1103     1105        +2     
===========================================
+ Hits         6187     7870     +1683     
+ Misses       3963     2911     -1052     
- Partials      262      354       +92     

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[JR-Morgan]

Tested Rhino, Autocad, Civil