Protobuf v6

[jgasparetti]

No description provided.

[jgasparetti]

Summary
In order to enable the use of protobuf v6, I had to update both the related libraries and the buf.build dependencies.

Changes

• Updated protobuf to version 6
• Updated dependent libraries accordingly
• Updated buf.build configurations to ensure compatibility

Notes
It’s important to highlight the strong coupling between connect-dart and protobuf versions.
To avoid compatibility issues, it is recommended to align their versions as follows:

• connect-dart ~ v4 → uses protobuf v4
• connect-dart ~ v6 → uses protobuf v6

Keeping these versions aligned should help prevent inconsistencies and runtime issues.

[srikrsna-buf]

Thank you for the PR. To minimize breaking users, I would like to do this is multiple steps. Can we first update to v5 while supporting the old versions. AFAIK, this shouldn't be a breaking change.

Once that is released, we can cut a new version that supports v6 and above.

[hansbala]

@jgasparetti let me know if you need help. I am also looking to support protobuf v6 in my packages.

[jgasparetti]

Thank you for the PR. To minimize breaking users, I would like to do this is multiple steps. Can we first update to v5 while supporting the old versions. AFAIK, this shouldn't be a breaking change.

Once that is released, we can cut a new version that supports v6 and above.

OK, I am going to work in that direction, from the first runs it seems that BuilderInfo.fromProto3Json and BuilderInfo.toProto3Json are removed and the generated proto are no longer working. I am going to test with an updated version of buf.build/protocolbuffers/dart respect to the v21