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

[romul]

I don't mind to brod updating.
But issue with snappyer compilation could be fixed by installing clang on your computer.

For example, on MacOS it could be done by running xcode-select –-install

[hidnasio]

Thanks for the response. Removing the system-dependent dependency would be a big improvement. We build multi-arch Docker images and use the same source on both macOS and Linux containers, so the architecture mismatch prevents us from sharing the same compilation binaries.

It's not a problem with Kaffe library per-se but as the new version of Brod just remove this sub dependency it's a good way of removing the side effect of having snappyer.

[chess4ever]

Hello, any update on this? We would like to use brod 4.X because it has some important connection improvements

[Copilot]

Pull request overview

This PR upgrades the brod dependency from v3 to v4 to resolve compilation issues with Erlang 27 and Elixir 1.17.2. The upgrade removes the problematic snappyer sub-dependency that was causing build failures.

Key Changes:

• Bumped brod dependency from ~> 3.0 to ~> 4.0
• Added crc32cer dependency constraint
• Documented breaking changes for compression support configuration

Reviewed changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
mix.exs	Updated brod to v4.0, added crc32cer dependency, and bumped project version to 2.0.0
README.md	Added new "Compression Config" section documenting required configuration for snappy/lz4 compression
CHANGELOG.md	Added v2.0.0 release notes with breaking changes and upgrade instructions for compression support

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