Upgrade `sqlx` to 0.7 #46

Job	Run time
doc	1m 33s
test	1m 58s
fmt	6s
clippy (runtime-tokio-native-tls, no-db w/o any)	34s
clippy (runtime-tokio-rustls, no-db w/o any)	59s
clippy (runtime-tokio-native-tls, all-databases w/o any)	55s
clippy (runtime-tokio-rustls, all-databases w/o any)	1m 6s
clippy (runtime-tokio-native-tls, mysql w/o any)	1m 9s
clippy (runtime-tokio-rustls, mysql w/o any)	49s
clippy (runtime-tokio-native-tls, mysql w/ any)	45s
clippy (runtime-tokio-rustls, mysql w/ any)	43s
clippy (runtime-tokio-native-tls, postgres w/o any)	40s
clippy (runtime-tokio-rustls, postgres w/o any)	47s
clippy (runtime-tokio-native-tls, postgres w/ any)	50s
clippy (runtime-tokio-rustls, postgres w/ any)	58s
clippy (runtime-tokio-native-tls, sqlite w/o any)	47s
clippy (runtime-tokio-rustls, sqlite w/o any)	53s
clippy (runtime-tokio-native-tls, sqlite w/ any)	58s
clippy (runtime-tokio-rustls, sqlite w/ any)	59s
	17m 29s

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