[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

include/eigenpy/variant.hpp

@@ -98,7 +98,6 @@ struct VariantValueToObject : VariantVisitorType<PyObject*, Variant> {
   using Base::operator();
 };
 
-
 /// Convert {boost,std}::variant<class...> alternative reference to a Python
 /// object. This converter return the alternative reference. The code that
 /// create the reference holder is taken from \see