ci: use --all when running cargo test

[cakebaker]

I noticed that not all tests are run in the CI. This PR adds --all when running cargo test.

Currently, it should fail with two "mismatched types" errors, which I fixed in #242

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.36%. Comparing base (2e01edd) to head (a631fba).
Report is 46 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #241      +/-   ##
==========================================
- Coverage   61.40%   61.36%   -0.04%     
==========================================
  Files          42       43       +1     
  Lines        4415     4434      +19     
  Branches      680      681       +1     
==========================================
+ Hits         2711     2721      +10     
- Misses       1546     1554       +8     
- Partials      158      159       +1     

Flag	Coverage Δ
macos_latest	46.07% <ø> (+0.05%)	⬆️
ubuntu_latest	58.55% <ø> (+0.04%)	⬆️
windows_latest	0.06% <ø> (-0.01%)	⬇️

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