Don't use deprecated generic_array module

[j-chmielewski]

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defguard_core::enterprise::ldap::hash::salted_sha1_hash currently depends on the deprecated generic_array crate. This dependency is brought in transitively via the sha1 crate.

It’s possible that an upcoming release of sha1 will update its dependency to generic_array v1.x, which should resolve the deprecation warning after running cargo update.

For now, #[allow(deprecated)] attributes have been added to suppress the warnings until the dependency is updated.