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Run CI against erlang 27.1

Not completely sure what the CI/coverage strategy is but it
seemed like: Test these old versions and the newest one!
So, I thought I'd upgrade the newest one.

Didn't upgrade the runner os as erlang 23 is only covered by
ubuntu 20.04: https://github.com/erlef/setup-beam?tab=readme-ov-file#compatibility-between-operating-system-and-erlangotp

This will reach EOL in a couple of months. So, testing against
erlang 23 will be quite a bit tougher then.