chore: update native tests actions/upload-artifact to v4. #2676

Job	Run time
parallel-NativeTests (alloydb-sample)	13m 3s
parallel-NativeTests (bigquery-sample)	12m 32s
parallel-NativeTests (bigquery)	12m 28s
parallel-NativeTests (core)	9m 33s
parallel-NativeTests (data-firestore)	12m 27s
parallel-NativeTests (data-firestore-sample)	12m 53s
parallel-NativeTests (datastore)	12m 53s
parallel-NativeTests (datastore-basic-sample)	11m 55s
parallel-NativeTests (kms)	11m 45s
parallel-NativeTests (kms-sample)	12m 42s
parallel-NativeTests (logging-sample)	12m 34s
parallel-NativeTests (metrics-sample)	14m 4s
parallel-NativeTests (pubsub-sample)	19m 49s
parallel-NativeTests (pubsub-bus-sample)	8m 15s
parallel-NativeTests (pubsub-integration-sample)	33m 14s
parallel-NativeTests (secretmanager)	11m 59s
parallel-NativeTests (secretmanager-sample)	12m 42s
parallel-NativeTests (spanner)	18m 34s
parallel-NativeTests (sql-mysql-sample)	11m 37s
parallel-NativeTests (sql-postgres-sample)	15m 36s
parallel-NativeTests (starter-firestore-sample)	12m 8s
parallel-NativeTests (storage)	11m 42s
parallel-NativeTests (storage-sample)	15m 44s
parallel-NativeTests (trace-sample)	13m 20s
parallel-NativeTests (vision)	13m 34s
parallel-NativeTests (vision-sample)	12m 57s
	6h 0m 0s

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