remove deprecated $supportedMhashAlgos values for Zend\Crypt\Key\Derivation\SaltedS2k

[weierophinney]

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Originally posted by @samsonasik at zendframework/zend-crypt#46

[weierophinney]

I've labeled this as a BC break. We cannot remove these until our minimum PHP version is 7.2 or higher (as that is the first version where they will no longer be in core.

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Originally posted by @weierophinney at zendframework/zend-crypt#46 (comment)

[samsonasik]

I created PR #8 for it.

[weierophinney]

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