Maintenance: Update rbnacl to resolve ffi deprecation warning #2782
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Follow-on to #2781, which was an automated security patch. It seems the automated patch updated unrelated gems, and while I reviewed the changelog for administrate, I didn't didn't notice the diff updated a bunch of unrelated packages.
One of the changes was to update ffi, which led to this deprecation warning when running tests or deploying:
```[DEPRECATION] Struct layout is already defined for class RbNaCl::HMAC::State. Redefinition as in /Users/me/.rbenv/versions/2.6.5/lib/ruby/gems/2.6.0/gems/rbnacl-7.1.0/lib/rbnacl/hmac/sha512.rb:105:in `class:State' will be disallowed in ffi-2.0.