Update upload-artifact github action (#1386) #724

Job	Run time
Dendrite: SQLite	5m 5s
Synapse: Py 3.8, SQLite 3.31.1, Monolith	8m 12s
Dendrite: Postgres	6m 33s
Synapse: Py 3.8, PG 12, Monolith	9m 57s
Synapse: Py 3.8, PG 12, Workers	13m 19s
Synapse: Py 3.10, PG 14, Monolith	13m 31s
Synapse: Py 3.10, PG 14, Workers	16m 43s
Synapse: debian-testing, Monolith	10m 30s
Synapse: debian-testing, Workers	14m 16s
	1h 38m 6s

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