Update eigen to fix dupl. symbols error.

Also added <cassert>, former code implicitly used an assert() function
from eigen which was recently renamed to eigen_assert().

MathLib/LinAlg/Eigen/EigenMatrix.h

@@ -11,6 +11,7 @@
 #pragma once
 
 #include <Eigen/Sparse>
+#include <cassert>
 #include <iosfwd>
 #include <string>
 

MathLib/Point3d.h

@@ -13,6 +13,7 @@
 #pragma once
 
 #include <Eigen/Core>
+#include <cassert>
 #include <limits>
 
 #include "mathlib_export.h"

web/data/versions.json

@@ -14,7 +14,7 @@
     "hugo": "0.122.0",
     "boost": "1.73.0",
     "eigen": "3.4.0",
-    "eigen-unsupported": "81e012c909475ab945a6730ec098b5bee7548184",
+    "eigen-unsupported": "9000b3767770f6dd0f4cfb12f4e19c71921885a4",
     "vtk": "9.3.0",
     "petsc": "3.18.6",
     "qt": "5.14.2",