ref(protocol-derive): Update crate to use syn 2 #16591

Job	Run time
Lint	1m 38s
Lint Rust Default Features	1m 3s
Setup build metadata	1s
Test (macos-latest)	1m 12s
Test All Features (ubuntu-latest)	1m 37s
Test (windows-latest)	3m 33s
Integration Tests	1m 47s
Test Python	51s
Build Relay Binary (relay, x86_64-unknown-linux-gnu)	2m 51s
Build Docker Image	0s
Publish Relay to DockerHub	0s
Sentry-Relay Integration Tests	0s
Upload build artifacts to gocd	0s
Publish Relay to GCR	0s
self-hosted-end-to-end	0s
	14m 33s

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