Use top-level OpenSSL constant

Michał Zającrequested to merge
mzajac/use-top-level-openssl-constant into master 
--- Labkit::FIPS ---
/home/quintasan/.local/share/mise/installs/ruby/3.3.9/lib/ruby/gems/3.3.0/gems/gitlab-labkit-1.0.1/lib/labkit/fips.rb:28:in `enabled?': uninitialized constant #<Class:Labkit::FIPS>::OpenSSL (NameError)

        return true if OpenSSL.fips_mode
                       ^^^^^^^
	from labkit_showcase.rb:42:in `<main>'
  43 │ puts "FIPS enabled? : #{Labkit::FIPS.enabled?}"

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