The sodium extension is only needed for argon2, iff:
- PHP is < 8.4 and built without libargon2
With PHP < 8.4 you can also enable argon2 without sodium by compiling
with libargon2 support.
With PHP 8.4 the argon2 support is included in php-openssl which is
already a hard requirement of Nextcloud.
Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>