chore: Test opentelemetry 1.51.0

[blakeli0]

Test if grpc-java is compatible with 1.51.0

[linux-foundation-easycla]

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[ejona86]

We don't support downgrades. If you downgrade you get to use it at your own risk. If there's a reason we should hold back some versions, tell us what is going on and we can see if it makes sense to downgrade ourselves.

[ejona86]

I've spoken to @blakeli0 separately, and the issue is opentelemetry-exporter-sender-okhttp and opentelemetry-sdk-extension-jaeger-remote-sampler bring in the new major version OkHttp 5, released 2025-07-02. We don't use either, but BOMs mean the new versions can get brought in easily enough. I suspect OTel will want to revert the bump to give people more time to absorb the incompatibilities. But gRPC is willing to downgrade the otel version to the last on OkHttp 4 to give people some time to work this out. As normal, users would be able to upgrade to newer versions of OTel if they need something from the newer version and aren't impacted by OkHttp 5. In no way do we want to contribute to delaying the upgrade to the new major version.

I'll look into this more tomorrow.