CI: Update Elixir & OTP build matrix, support old OTP versions#200

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sgerrand wants to merge 6 commits intomichalmuskala:masterfrom

sgerrand:ci-add-elixir-1.16-otp-17

Commits on Apr 24, 2025

Test against Elixir 1.16 and Erlang/OTP 27 in CI
sgerrand
committed

Commits on May 6, 2025

Run OTP versions which rely on ancient OpenSSL versions in container
sgerrand
committed