Update code for the new OTP 22-25 maintenance range

[paulo-ferraz-oliveira]

This is mostly removing code and updating the CI pipeline for 22-25 (now with cache).

(I took the liberty to update the minimum to OTP 22 - this was previously, in the "other" pull request OTP 21, but in the meantime an extra OTP version was released)

In CI we also update some of the action tools' versions.

Further considerations

The pull request is probably best seen with Hide whitespace enabled, since there's some changes that are just indentation ones.

I'm also temporarily disabling rebar3_lint in this pull request, since that bring other issues with it requiring to be updated, but will handle it in a subsequent pull request.

Note: support for OTP 26 and 27 is not present, as this was discussed before: https://github.com/elli-lib/elli/pull/114#issuecomment-1654784150

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 77.77778% with 2 lines in your changes missing coverage. Please review.

Project coverage is 76.40%. Comparing base (3ec3522) to head (9db9cc1).

Files	Patch %	Lines
src/elli_http.erl	77.77%	2 Missing :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #119 +/- ## ========================================== + Coverage 76.32% 76.40% +0.07% ========================================== Files 12 12 Lines 756 750 -6 ========================================== - Hits 577 573 -4 + Misses 179 177 -2 ```

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[paulo-ferraz-oliveira]

@tsloughter

[tsloughter]

Thanks for these! I will get to this very soon.