Bump SQLx to 0.8 #674

Job	Run time
Clippy	1m 4s
Compile SQLite (live/sqlite)	3m 20s
Compile MySQL (live/mysql)	3m 17s
Compile SQLite (discovery/sqlite)	3m 12s
Compile Postgres (live/postgres)	3m 18s
Compile MySQL (discovery/mysql)	3m 16s
Compile Postgres (discovery/postgres)	3m 17s
Compile SQLite (writer/sqlite)	3m 13s
Rustfmt	13s
Compile MySQL (writer/mysql)	3m 17s
Compile Postgres (writer/postgres)	3m 13s
Unit Test	1m 21s
MariaDB (10.6, live/mysql)	44s
MariaDB (10.6, discovery/mysql)	42s
MariaDB (10.6, writer/mysql)	41s
MySQL (8, live/mysql)	1m 10s
MySQL (8, discovery/mysql)	56s
MySQL (8, writer/mysql)	1m 2s
MySQL (5.7, live/mysql)	49s
MySQL (5.7, discovery/mysql)	51s
MySQL (5.7, writer/mysql)	1m 1s
Postgres (14.4, live/postgres)	1m 1s
Postgres (14.4, discovery/postgres)	1m 29s
Postgres (14.4, writer/postgres)	1m 8s
SQLite (live/sqlite)	30s
SQLite (discovery/sqlite)	18s
SQLite (writer/sqlite)	18s
	44m 41s

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