sqlx without default-features puts unnecessary database crates in my Cargo.lock

[djc]

Bug Description

I use sqlx with Postgres support, and don't need MySQL or SQLite support. Yet, when I add sqlx 0.7 as a dependency with default-features = false, features = ["chrono", "ipnetwork", "json", "macros", "migrate", "postgres", "runtime-tokio-rustls"] I still end up with sqlx-mysql and sqlx-sqlite in my Cargo.lock file. I don't think this should be the case -- it certainly didn't happen with sqlx 0.6 (even though I previously didn't even have default-features = false).

Info

• SQLx version: 0.7.0
• SQLx features enabled: ["chrono", "ipnetwork", "json", "macros", "migrate", "postgres", "runtime-tokio-rustls"]
• Database server and version: should be irrelevant? (Postgres 14)
• Operating system: macOS
• rustc --version: rustc 1.70.0 (90c541806 2023-05-31)

[djc]

Maybe this is an artifact of how weak dependencies work? These crates don't seem to result in artifacts in target/debug/deps.

[djc]

Okay, yeah, this is rust-lang/cargo#10801.