Missing dependency on bigdecimal

[JamieMagee]

Input

N/A

Run srb tc while using Ruby 3.3.0

Observed output

A warning that bigdecimal is loaded from the standard library, but should instead be added as a dependency.

/home/runner/work/dependabot-core/dependabot-core/vendor/bundle/ruby/3.3.0/gems/sorbet-0.5.11353/lib/serialize.rb:4: warning: bigdecimal was loaded from the standard library, but will no longer be part of the default gems since Ruby 3.4.0. Add bigdecimal to your Gemfile or gemspec. Also contact author of sorbet-0.5.11353 to add bigdecimal into its gemspec.

Expected behavior

No console warning

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