Fix unused local typedef warning in matrix exponential

Tyler Venessrequested to merge
calcmogul/eigen:fix-unused-local-typedef-warning-in-matrix-exponential into master

I got this warning in CI with Apple Clang 16.

/Users/runner/work/Sleipnir/Sleipnir/build/_deps/eigen3-src/unsupported/Eigen/src/MatrixFunctions/MatrixExponential.h:287:11: error: unused type alias 'Scalar' [-Werror,-Wunused-local-typedef]
  287 |     using Scalar = typename traits<MatrixType>::Scalar;
      |           ^
Edited by Tyler Veness

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