Update maximum supported edition to EDITION_2024

[mkruskal-google]

gRPC doesn't do anything sensitive to the new 2024 features

[sergiitk]

ref cl/829077940

[sergiitk]

/gcbrun

[ejona86]

EDITION_2024 symbol was added in 26.0 protocolbuffers/protobuf@f441ce8 . Luckily we are on 26.1.

But I'm not certain that is enough. At the very least, features.(pb.java).nest_in_file_class looks like it requires libprotoc support, and we're probably on too old of a version. I dunno about features.default_symbol_visibility. FWIW, it's unclear to me how to figure out what was added in an addition, for us to check compatibility.

So I suspect this actually needs some protobuf version detection. It looks like we should be detecting v32.0+ to change the returned edition supported.

[mkruskal-google]

Protoc itself will reject 2024 protos if it's earlier than 32.0. But you make a good point that if you're building against an older version of libprotoc the java naming helpers you're using might not support the changes we made to java_multiple_files and java_outer_classname yet (symbol visibility isn't an issue for plugins).

How realistic would it be to either:

1. Bump the libprotoc dependency to a newer version that actually supports 2024
2. Copybara strip this so we can at least enable 2024 in google3