Update upload-artifact github action (#1386) #726

Job	Run time
Dendrite: SQLite	4m 44s
Dendrite: Postgres	6m 24s
Synapse: Py 3.8, SQLite 3.31.1, Monolith	8m 27s
Synapse: Py 3.8, PG 12, Monolith	10m 9s
Synapse: Py 3.8, PG 12, Workers	13m 26s
Synapse: Py 3.10, PG 14, Monolith	14m 16s
Synapse: Py 3.10, PG 14, Workers	18m 26s
Synapse: debian-testing, Monolith	11m 37s
Synapse: debian-testing, Workers	13m 52s
	1h 41m 21s

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