Bump SQLx to 0.8 #673

Job	Run time
Clippy	1m 2s
Compile MySQL (live/mysql)	3m 27s
Compile Postgres (live/postgres)	3m 20s
Compile SQLite (live/sqlite)	3m 16s
Compile MySQL (discovery/mysql)	3m 22s
Compile Postgres (discovery/postgres)	3m 15s
Rustfmt	11s
Compile SQLite (discovery/sqlite)	3m 9s
Compile MySQL (writer/mysql)	3m 15s
Compile Postgres (writer/postgres)	3m 18s
Compile SQLite (writer/sqlite)	3m 17s
Unit Test	1m 24s
SQLite (live/sqlite)	23s
SQLite (discovery/sqlite)	18s
SQLite (writer/sqlite)	17s
Postgres (14.4, live/postgres)	1m 7s
Postgres (14.4, discovery/postgres)	56s
Postgres (14.4, writer/postgres)	1m 0s
MariaDB (10.6, live/mysql)	40s
MariaDB (10.6, discovery/mysql)	41s
MySQL (8, live/mysql)	1m 1s
MySQL (8, discovery/mysql)	53s
MariaDB (10.6, writer/mysql)	41s
MySQL (8, writer/mysql)	45s
MySQL (5.7, live/mysql)	52s
MySQL (5.7, discovery/mysql)	44s
MySQL (5.7, writer/mysql)	1m 2s
	43m 36s

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