Update sqlx #473

Job	Run time
build	5m 23s
fmt	14s
clippy	2m 7s
tests (coverage-point-calculator)	1m 57s
tests (ingest)	2m 2s
tests (coverage-map)	1m 23s
tests (reward-scheduler)	53s
tests (task-manager)	1m 4s
tests-postgres (file-store)	2m 34s
tests-postgres (boost-manager)	2m 37s
tests-postgres (iot-config)	2m 56s
tests-postgres (iot-packet-verifier)	4m 11s
tests-postgres (iot-verifier)	3m 4s
tests-postgres (mobile-config)	2m 48s
tests-postgres (mobile-packet-verifier)	3m 0s
tests-postgres (mobile-verifier)	2m 46s
build-release	0s
	38m 59s

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