Lock state access in builtinProvider.getResource (#16225)

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# Description

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Found by data race checker.

pkg/resource/deploy/builtins.go

@@ -321,6 +321,10 @@ func (p *builtinProvider) getResource(inputs resource.PropertyMap) (resource.Pro
  return nil, fmt.Errorf("unknown resource %v", urn.StringValue())
  }
 
+ // Take the state lock so we can safely read the Outputs.
+ state.Lock.Lock()
+ defer state.Lock.Unlock()
+
  return resource.PropertyMap{
  "urn": urn,
  "id": resource.NewStringProperty(string(state.ID)),