ci: update actions/upload-artifact to v4 with merge #15399

Job	Run time
Lint	2m 51s
Lint Rust Default Features	1m 22s
Test (macos-latest)	2m 39s
Test (windows-latest)	5m 43s
Test All Features (ubuntu-latest)	3m 28s
Setup build metadata	1s
Test Python	1m 4s
Integration Tests	12m 11s
Build Relay Binary (relay, x86_64-unknown-linux-gnu)	8m 14s
Build Relay Binary (relay, aarch64-unknown-linux-gnu)	7m 49s
Build Relay Binary (relay-pop, x86_64-unknown-linux-gnu)	7m 6s
Build Relay Binary (relay-pop, aarch64-unknown-linux-gnu)	7m 41s
Build Docker Image (relay)	1m 32s
Build Docker Image (relay-pop)	1m 33s
Sentry-Relay Integration Tests	12m 0s
Publish Relay to DockerHub	0s
Upload build artifacts to gocd (relay)	40s
Publish Relay to GCR (relay)	42s
Upload build artifacts to gocd (relay-pop)	36s
Publish Relay to GCR (relay-pop)	35s
self-hosted-end-to-end	13m 48s
	1h 31m 35s

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