Upgrade to SQLx v0.7 #563

Job	Run time
Compile MySQL (live/mysql)	1m 54s
Compile MySQL (discovery/mysql)	1m 45s
Compile MySQL (writer/mysql)	1m 50s
Compile Postgres (live/postgres)	1m 48s
Compile Postgres (discovery/postgres)	2m 19s
Compile Postgres (writer/postgres)	2m 7s
Compile SQLite (live/sqlite)	2m 0s
Compile SQLite (discovery/sqlite)	1m 23s
Compile SQLite (writer/sqlite)	1m 42s
Rustfmt	16s
Unit Test	2m 28s
Clippy	1m 39s
MySQL (8, live/mysql)	1m 8s
MySQL (8, discovery/mysql)	1m 9s
MySQL (8, writer/mysql)	1m 2s
MySQL (5.7, live/mysql)	1m 12s
MySQL (5.7, discovery/mysql)	55s
MySQL (5.7, writer/mysql)	1m 9s
MariaDB (10.6, live/mysql)	1m 3s
MariaDB (10.6, discovery/mysql)	53s
MariaDB (10.6, writer/mysql)	53s
SQLite (live/sqlite)	34s
SQLite (discovery/sqlite)	32s
SQLite (writer/sqlite)	32s
Postgres (14.4, live/postgres)	1m 46s
Postgres (14.4, discovery/postgres)	1m 31s
Postgres (14.4, writer/postgres)	1m 37s
	37m 7s

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