Fix spec for elli:stop/1

[paulo-ferraz-oliveira]

Closes #111.

Depends on the CI file updates from #114, so shall be rebased and updated (if required) after that one.

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 76.40%. Comparing base (05e24b1) to head (bda6af9). Report is 26 commits behind head on main.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #113 +/- ## ========================================== + Coverage 76.30% 76.40% +0.09% ========================================== Files 12 12 Lines 764 750 -14 ========================================== - Hits 583 573 -10 + Misses 181 177 -4 ```

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[paulo-ferraz-oliveira]

~CI failing for OTP 26, and 25. I'll try to replicate locally.~

[paulo-ferraz-oliveira]

~It's possible the failure for non-OTP 26 is due to #99, since re-executing the tests (in a fork) showed ✅.~

[paulo-ferraz-oliveira]

~Removed OTP 26 from scope, since there're SSL -related issues to solve. Should be moved to a new PR, I guess...~

[paulo-ferraz-oliveira]

Moved to draft. These don't need to be reviewed before #114, after which I'll rebase.

[paulo-ferraz-oliveira]

@tsloughter