Tweak `rebar.config` (update deps then fixed issue warnings)

[paulo-ferraz-oliveira]

We update versions of deps and plugins and fix warnings issued from that. It's possible a commit-by-commit review makes it easier to spot how we did stuff.

Further considerations

Most of the changes done previously in https://github.com/elli-lib/elli/pull/114 where from elvis_core's rule operator_spaces, which is disabled in this pull request.

⚠️ as per https://github.com/elli-lib/elli/pull/120#discussion_r1638068811 we also up min. supported OTP version to 24.

[paulo-ferraz-oliveira]

CI's failing: I'm up'ing rebar3 version, since it's possible it suffered a fix that CI didn't get to (using 3.14, at this moment)

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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 (4e9012f). Report is 9 commits behind head on main.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #120 +/- ## ========================================== + 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]

Merge conflicts are solved.

[paulo-ferraz-oliveira]

@tsloughter

[tsloughter]

Will merge with that one fix.

[tsloughter]

I figure it its a general function in the tests for use anywhere so may as well cover them all.

[paulo-ferraz-oliveira]

Thanks. I'll move to the next one, by rebasing on top of the main branch.