Update to phpass 0.5.4

[jrf]

While nothing ground shaking, the upstream package has had some minor tweaks, so syncing in the upstream changes would keep us up to date and will make future code-comparisons more straight-forward.

Previous: #51549

There have been some small changes made in the upstream script. Nothing very significant, but still worth porting over to make future comparisons easier.

In particular:

• Use of curly braces for control structures.
• Removal of a ternary related to PHP 4.
• Removal of some unnecessary parentheses.

Ref: ​https://github.com/openwall/phpass

Trac ticket: https://core.trac.wordpress.org/ticket/62058

[desrosj]

In 59030:

External Libraries: Update PHPass library.

This updates the PHPass library to version 0.5.4 while maintaining the adjustments introduced in [30466].

Props jrf.
Fixes #62058.

Merged in https://core.trac.wordpress.org/changeset/59030.

[jrf]

Thanks @desrosj for handling this one so quickly!