Bump SQLx to 0.8 #680

Job	Run time
Compile SQLite (live/sqlite)	3m 21s
Compile MySQL (live/mysql)	3m 19s
Compile SQLite (discovery/sqlite)	3m 4s
Compile Postgres (live/postgres)	3m 13s
Clippy	1m 8s
Compile MySQL (discovery/mysql)	3m 13s
Compile SQLite (writer/sqlite)	3m 2s
Compile Postgres (discovery/postgres)	3m 10s
Compile MySQL (writer/mysql)	3m 15s
Compile Postgres (writer/postgres)	3m 24s
Rustfmt	12s
Unit Test	1m 15s
MySQL (8, live/mysql)	44s
MariaDB (10.6, live/mysql)	44s
MySQL (8, discovery/mysql)	48s
MariaDB (10.6, discovery/mysql)	1m 2s
MySQL (8, writer/mysql)	41s
MariaDB (10.6, writer/mysql)	51s
MySQL (5.7, live/mysql)	52s
MySQL (5.7, discovery/mysql)	44s
MySQL (5.7, writer/mysql)	44s
SQLite (live/sqlite)	13s
SQLite (discovery/sqlite)	12s
SQLite (writer/sqlite)	12s
Postgres (14.4, live/postgres)	1m 31s
Postgres (14.4, discovery/postgres)	1m 22s
Postgres (14.4, writer/postgres)	1m 4s
	43m 20s

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