chore: remove drivers other than postgres #18

Job	Run time
node-mysql (examples/node-mysql2, mysql)	14s
bun-postgresql (examples/bun-postgres, postgresql)	29s
node-postgresql (examples/node-postgres, postgresql)	30s
bun-mysql (examples/bun-mysql2, mysql)	19s
bun-postgresql (examples/bun-pg, postgresql)	31s
node-postgresql (examples/node-pg, postgresql)	32s
	2m 35s

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