* fix(ci): pin the Hex archive the elixir publish loads

mix local.hex tracks latest, whose beams the pinned OTP 29 runtime
refuses to load. Pin 2.0.6: old beams load on any newer runtime, and
the publish flow itself is unchanged.

* fix(ci): invoke setup-beam mix by absolute path for Hex publish

PATH games leave doubt about which mix runs the publish; the absolute
path does not.

* chore(bindings): bump to 0.1.10 for the tenth release attempt