Relax required ruby version

[such]

What? Why?

Ruby 3.1 was released.
I used no max version, the same way Rails does (amongst others).

How was it tested?

Ran rspec with ruby 3.1

[splittingred]

Hey @such - thanks! While I can test and run this fine locally, we require CircleCI tests for each ruby version (see .circleci/config.yml), and this would also need to update the README and CHANGELOG appropriately to adjust the supported versions.

I believe there's an outstanding issue with Ruby 3.1 and bundler and the core grpc gem that causes OOMs on install in CircleCI, due to CCI using bundler 2.3.3 (which had a packaging issue that resulted in the runtime being broken there). We may have to wait until CCI updates their ruby 3.1 image to bundler 2.3.4 before proceeding. They're typically fairly fast so I'd expect that within a week or so.

[such]

Hey @splittingred.
Thank you for the feedback! I'll make those changes!

In the meantime, I'm also having issues with my ruby 3.1 docker image... Can you point me to a thread that talks about this? Do you know if the issue is specific to grpc?

[splittingred]

@such I believe the CCI issue is related grpc not having pre-built binaries for Ruby 3.1, causing it to have to compile at install time (which makes the gemset huge for one).

See grpc/grpc#28627

Also, google-protobuf does not yet support Ruby 3.1:

protocolbuffers/protobuf#9364

[splittingred]

Hello @such ! I've opened #150 to get this to work; though it's noted that grpc/grpc#28627 is still an issue, so initial uncached installations of the grpc gem will take a long time.

However, this passes tests and end-to-end suites, so we're good to allow it in gruf now.

[splittingred]

This has been merged in #150 - closing this. Thanks!