update default max packetsize to 64k to prevent too big packets sent

[thomasLeclaire]

Quick "Fix" proposal for bug https://github.com/open-telemetry/opentelemetry-ruby/issues/1148

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• :white_check_mark: login: thomasLeclaire / name: Thomas Leclaire (2e796eb3fcbafa488c5c0ce3b5f73773894ac747)

[fbogsany]

Thanks for the bug report @thomasLeclaire. I think the problem goes a little deeper than this, and I'd like us to fix the root cause. We are not only ignoring the Thrift protocol overhead, we are also ignoring the Process (Resource, in OTel terminology) size in the batching calculation. This is a lot more variable and I don't think we can just drop the limit by 1000 bytes.

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