Update Eigen to commit:8c43bf2b5b333ddda386e0f5424b3070a760651b

CHANGELOG
=========
8c43bf2b5 - Clean up Redux.h and fix vectorization_logic test after changes to traversal order in Redux.
da6a71faf - Add linear redux evaluators
67a1e881d - Sparse matrix column/row removal
de1c88468 - Add reference to writeup of approach used in canonicalEulerAngles.
307a417e1 - Fix unrolled assignment evaluator

PiperOrigin-RevId: 535057389
Change-Id: Ib029b735ce649daa1f71034fa6ea46b46337bfc6
7 files changed