Fix type hinting on Compose

[ej159]

This is pretty self-explanatory; the type hint was incorrect and this fixes it.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 74.98%. Comparing base (8f95aec) to head (dfcf429).
⚠️ Report is 5 commits behind head on develop.
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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #332      +/-   ##
===========================================
- Coverage    76.50%   74.98%   -1.53%     
===========================================
  Files           48       49       +1     
  Lines         2992     3054      +62     
===========================================
+ Hits          2289     2290       +1     
- Misses         703      764      +61     

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