Make tests run on all file changes (not just `src` etc.)

[jagoosw]

When repo was private we did this to save action minutes but they're unlimitted on public repos

[codecov[bot]]

Codecov Report

Patch and project coverage have no change.

Comparison is base (30c73f9) 52.78% compared to head (632a475) 52.78%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #97 +/- ## ======================================= Coverage 52.78% 52.78% ======================================= Files 26 26 Lines 1023 1023 ======================================= Hits 540 540 Misses 483 483 ```

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