Fix clashing contexts

[DominicOram]

See also the test in bluesky/ophyd-async#600

[AlexanderWells-diamond]

The CI failures here will be fixed by the changes that I'm working on in #50

[DominicOram]

Are you happy to merge despite the CI failures @coretl?

[coretl]

@AlexanderWells-diamond how close are your CI updates? We can either merge and release this as is (possibly disabling tests to get it to publish), or wait for your updates?

[AlexanderWells-diamond]

I'm working on a full adoption of the Copier template, which will involve things like moving the source files around. See #52 which replaced #50.

[codecov]

Codecov Report

Attention: Patch coverage is 78.57143% with 3 lines in your changes missing coverage. Please review.

Project coverage is 99.33%. Comparing base (8a28070) to head (02a527d).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
src/aioca/_catools.py	78.57%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #51      +/-   ##
===========================================
- Coverage   100.00%   99.33%   -0.67%     
===========================================
  Files            4        4              
  Lines          446      453       +7     
===========================================
+ Hits           446      450       +4     
- Misses           0        3       +3     

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[DominicOram]

Discussed with @coretl, he's happy to merge without full coverage