Bump SQLx to 0.8 #679

Job	Run time
Compile SQLite (live/sqlite)	3m 20s
Compile MySQL (live/mysql)	3m 13s
Clippy	59s
Compile SQLite (discovery/sqlite)	3m 6s
Compile MySQL (discovery/mysql)	3m 14s
Compile SQLite (writer/sqlite)	3m 24s
Compile Postgres (live/postgres)	3m 11s
Compile MySQL (writer/mysql)	3m 21s
Compile Postgres (discovery/postgres)	3m 7s
Rustfmt	11s
Compile Postgres (writer/postgres)	3m 12s
Unit Test	1m 34s
MariaDB (10.6, live/mysql)	1m 27s
MySQL (8, live/mysql)	1m 16s
MariaDB (10.6, discovery/mysql)	55s
MySQL (8, discovery/mysql)	53s
MariaDB (10.6, writer/mysql)	1m 8s
MySQL (8, writer/mysql)	40s
MySQL (5.7, live/mysql)	42s
MySQL (5.7, discovery/mysql)	1m 36s
MySQL (5.7, writer/mysql)	44s
Postgres (14.4, live/postgres)	1m 10s
Postgres (14.4, discovery/postgres)	1m 15s
Postgres (14.4, writer/postgres)	1m 19s
SQLite (live/sqlite)	13s
SQLite (discovery/sqlite)	23s
SQLite (writer/sqlite)	42s
	46m 15s

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