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Bump CI to Elixir 1.20 and OTP 29

Move the lint/coverage matrix row and the hex publish workflow up to the
latest Elixir (1.20) and Erlang/OTP (29) releases. The minimum-supported
row (1.16/24.2) is left in place to keep testing the floor declared in
mix.exs (~> 1.16).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>