Upgrade/Install: Update sodium_compat to v1.17.0.
The latest version of sodium_compat includes fixes for PHP 8.1 compatibility and a fix for PHP 5.6 compatibility.
A full list of changes in this update can be found on GitHub:
https://github.com/paragonie/sodium_compat/compare/v1.16.1...v1.17.0
Follow-up to [49741], [51002].
Props jrf.
Fixes #53907.
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