[ruby/zlib] Add truffleruby-head in CI
https://github.com/ruby/zlib/commit/8abc80b994
[ruby/zlib] Add truffleruby-head in CI
https://github.com/oracle/truffleruby/commit/c77f8bb35db084c99d1f5b14748267866004222e
https://github.com/ruby/zlib/commit/8abc80b994