Newsletter entries for libMesh submodule update

modules/doc/content/newsletter/2024/2024_01.md

@@ -9,6 +9,34 @@ for a complete description of all MOOSE changes.
 
 ## libMesh-level Changes
 
+### `2024.01.04` Update
+
+- New example illustrating a Hybridized Discontinuous Galerkin solve
+- Added new finite element support: the `HIERARCHIC_VEC` FE family,
+  for vector-valued hierarchic shape functions, and the
+  `L2_HIERARCHIC_VEC` FE family, for the broken/L2 version of that
+  space.  Added simple-vector-valued example and
+  Hybridized-Discontinuous-Galerkin example runs using these families.
+- Support for a pre-check object callback from PetscNonlinearSolver
+- Keep track of libMesh command line queries, and avoid spurious
+  unused-option warnings about them from PETSc
+- Support for upgrading the order of mixed-order input meshes in
+  `all_second_order()` and `all_complete_order()`
+- Support for neighbor-finding and mesh stitching with mixed-order
+  input meshes.  Mixed-order meshes must still be upgraded before
+  being used to support C0 finite element types in a linear solve
+  (where constraint equations would be needed between
+  incompatible-order neighbors), but mesh generation and modification
+  with pre-upgraded mixed-order meshes is now possible.
+- Support for more preconditioning options in EigenSparseLinearSolver;
+  this allows us to reenable a dozen examples that were previously
+  skipped when Eigen was configured as the default linear algebra
+  package.
+- Minor fixes to reduced basis code, string parsing of uncommon
+  quadrature rule names, configuration on systems without stdlib.h, 
+- Minor clarifications and typo fixes in documentation, comments, and
+  runtime error messages
+
 ## PETSc-level Changes
 
 ## Bug Fixes and Minor Enhancements