chore: Upgrade brod dependency to v4

[hidnasio]

Trying to compile kaffe throws the following error

** (Mix) Could not compile dependency :snappyer, "/Users/luisferreira/.asdf/installs/elixir/1.17.2-otp-27/.mix/elixir/1-17/rebar3 bare compile --paths /Users/luisferreira/Projects/kaffe/_build/dev/lib/*/ebin" command failed. Errors may have been logged above. You can recompile this dependency with "mix deps.compile snappyer --force", update it with "mix deps.update snappyer" or clean it with "mix deps.clean snappyer"

using erlang 27 and elixir 1.17.2

The problem is related a sub dependency of Brod library. This sub dependency was removed in Brod 4.0