Switch from dirs_next 2.0 to dirs 5.0 (#13384)

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# Description
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Replaces the `dirs_next` family of crates with `dirs`. `dirs_next` was
born when the `dirs` crates were abandoned three years ago, but they're
being maintained again and most projects depend on `dirs` nowadays.
`dirs_next` has been abandoned since.

This came up while working on
https://github.com/nushell/nushell/pull/13382.

# User-Facing Changes
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None.

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Tests and formatter have been run.

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crates/nu-command/src/system/run_external.rs

@@ -606,7 +606,7 @@ mod test {
             assert_eq!(actual, expected);
 
             let actual = expand_glob("~/foo.txt", cwd, Span::unknown(), &Signals::empty()).unwrap();
-            let home = dirs_next::home_dir().expect("failed to get home dir");
+            let home = dirs::home_dir().expect("failed to get home dir");
             let expected: Vec<OsString> = vec![home.join("foo.txt").into()];
             assert_eq!(actual, expected);
         })