chore(deps): bump thirdparty/eigen from `afb1728` to `b9b1c86`

[dependabot[bot]]

Bumps thirdparty/eigen from afb1728 to b9b1c86.

Commits

• b9b1c86 Suppress C++23 deprecation warnings for std::has_denorm and std::has_denorm_loss
• 3d2e738 fix performance-no-int-to-ptr
• de8013f Fix ubsan failure in array_for_matrix
• 5e4f347 Remove call to deprecated method initParallel() in SparseDenseProduct.h
• 59cf0df SparseMatrix::insert add checks for valid indices
• c0fe6ce Fixed a clerical error at documentation of class Matrix.
• See full diff in compare view

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