Update Eigen to commit:4c2611d27cb9a5fe12e18c8953097871db1d3abf

CHANGELOG
=========
4c2611d27 - Update check for std::hardware_destructive_interference_size
c079ee5e4 - Fix tensor documentation.
74264c391 - Add missing return statements for ppc.
3ebe898b5 - Build and deploy nightly docs.

PiperOrigin-RevId: 723630092
Change-Id: I4d429697d4943480a550b3fb1e4fad838116564a