Use SQLx in ping query

[emmiegit]

The first migrated query, this one is an ad hoc one to ensure the database is connected, so doesn't benefit from SeaORM at all.

api-1       | sqlx::query summary="SELECT 1" db.statement="" rows_affected=1 rows_returned=1 elapsed=1.104059ms elapsed_secs=0.001104059
api-1       | deepwell::endpoints::misc Successfully pinged Postgres
api-1       | deepwell::endpoints::misc Successfully pinged Redis
api-1       | sqlx::query summary="COMMIT" db.statement="" rows_affected=0 rows_returned=0 elapsed=232.294µs elapsed_secs=0.000232294

Also bumps the deepwell version since it's been a while.

[emmiegit]

thanks @Yossipossi1