ci: Update Actions dependencies to use Node 20 #6781

Job	Run time
Matrix Client Tests (1, 6)	8m 51s
Matrix Client Tests (2, 6)	7m 4s
Matrix Client Tests (3, 6)	6m 49s
Matrix Client Tests (4, 6)	6m 46s
Check which packages changed	0s
Matrix Client Tests (5, 6)	7m 18s
Matrix Client Tests (6, 6)	8m 0s
Lint	2m 21s
AI bot Tests	38s
Boxel Motion Tests	1m 11s
Boxel UI ensure raw icon changes only	40s
Boxel UI Tests	1m 13s
Host Tests	16m 2s
Realm Server Tests	6m 32s
deploy-ai-bot	0s
Merge Matrix reports and publish	55s
Deploy boxel to staging	0s
	1h 14m 20s

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