chore(deps): Set default-features=false on sqlx in workspace.dependencies

[iamjpotts]

Does your PR solve an issue?

Resolves this cargo check warning:

    warning: ./sqlx-cli/Cargo.toml: `default-features` is ignored for sqlx, since `default-features` was not specified for 
    `workspace.dependencies.sqlx`, this could become a hard error in the future

Is this a breaking change?

No:

• Would only affect dependencies of sqlx-cli which is already attempting to set default-features=false but that has no effect (thus the warning) because the workspace level declaration of the dependency brings in all default features.
• sqlx-cli is a binary crate, not a library crate

[abonander]

I tried this but it breaks the examples. I don't want them to use default-features = false.

[iamjpotts]

I tried this but it breaks the examples. I don't want them to use default-features = false.

It did break one of them, but I fixed it by adding macros to its required features for the sqlx dependency.

[iamjpotts]

The examples passed ci after the minor tweak to one of them.

this could become a hard error in the future seems like reasonable motivation for the change.