Pgsql cube type compile fail

[kdesjard]

Does your PR solve an issue?

Resolves #3461
Resolves #3460
Replaces #3457
Replaces #3456

The Postgresql cube type fails to compile in version 0.8.1:

.../sqlx-postgres-0.8.1/src/types/cube.rs:307:33
    |
307 |     const PACKED_WIDTH: usize = size_of::<u32>();
    |                                 ^^^^^^^ not found in this scope
    |
help: consider importing one of these items
    |
1   + use core::mem::size_of;
    |
1   + use std::mem::size_of;

The PR includes a patch for this as well as a scoping change for the hstore type to keep it consistent with the others.

[CommanderStorm]

Could you add the following to your PR-description? (this way, other users have a link to follow)

Resolves #3461
Resolves #3460
Replaces #3457
Replaces #3456

[abonander]

@kdesjard cargo fmt needs to be run.

[imor]

@kdesjard could you please run cargo fmt and push a commit. Without this fix pg_replicate's MSRV needs to be bumped which we'd like to avoid.

[kdesjard]

I did push a commit f47ce6b

Am I missing something?