[deprecation] Use SolidusSupport::EngineExtensions

[peterberkenbosch]

DEPRECATION WARNING: SolidusSupport::EngineExtensions::Decorators is deprecated! Use SolidusSupport::EngineExtensions instead. (called from <class:Engine> at /Users/peterberkenbosch/code/peterberkenbosch/solidus_affirm/lib/solidus_affirm/engine.rb:7)

[stale]

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