Remove `sqlx["time"]` feature requirement for etl-postgres

[andyyu2004]

Hi, enabling sqlx's "time" feature causes issues with any workspace that uses the "chrono" feature of sqlx. It seems the feature is unused by this crate and so it should be removed.

Relevant sqlx issue
launchbadge/sqlx#3412 (comment)

[iambriccardo]

Thanks for the report! The PR which fixes this problem is here: #497