Update dirs to 5.0.0

[marcusirgens]

As far as I can tell, dirs is used only in sqlx-postgres/src/options/pgpass.rs

    #[cfg(not(target_os = "windows"))]
    let default_file = dirs::home_dir().map(|path| path.join(".pgpass"));
    #[cfg(target_os = "windows")]
    let default_file = dirs::data_dir().map(|path| path.join("postgres").join("pgpass.conf"));

The breaking changes between these versions are, according to the authors:

• Update dirs-sys dependency to 0.4.0.
• Add config_local_dir for non-roaming configuration on Windows. On non-Windows platforms the behavior is identical to config dir.

home_dir() is Some($HOME) for all non-Windows targets in both 4.0.0 and 5.0.0.
data_dir() is Some({FOLDERID_RoamingAppData}) for Windows in both 4.0.0 and 5.0.0

I cannot find any references to dirs in sqlx-mysql. Is it possible it is no longer used in that package?

[abonander]

@marcusirgens when restructuring the crates I just copy-pasted the dependencies from one to another as I didn't want to sift through them individually and a lot of them were used by every driver. If the dirs crate isn't used by sqlx-mysql you can go ahead and remove it if you like.