update CI to the latest Elixir 1.11 and Erlang 23. Add Elixir 1.12 and Erlang 24

[baseballlover723]

Also upgrades the local Elixir version to 1.12.2 and the Erlang version to 24.0.5. This also includes a mix format since Elixir 1.12 made a backwards incompatible formatting change as well as only running the format check in CI on Elixir 1.12+.

This also changes CI to not fail as soon a single job fails, this is needed for now, since CI fails on Erlang 24. This is probably for the better since you can see if CI fails for just a single Elixir / Erlang combination or for all of them.

[jeremyjh]

Hi, thanks for working on this! I think to resolve the errors on OTP 24 we could just remove this entire check from the tests:

dialyxir/.github/workflows/test.yml

Line 98 in 242c0e8

run: mix dialyzer --list-unused-filters

; it would be hard to keep broad compatibility and still check this.

Also, I would be fine with dropping the 1.9.4 targets entirely since that is 4 releases ago, my original thought was to support the 3 most recent releases anyway.

[baseballlover723]

This has been updated

[baseballlover723]

I have no idea why the tests fail now, but most of them did work when I originally pushed it up, https://github.com/jeremyjh/dialyxir/runs/3248958978

[jeremyjh]

The problem is we're no longer running any dialyzer check before the output_test, so output_test has to build the PLTs etc. Re-ordering the output tests like this will fix it.

[jeremyjh]

Thanks!