Update NEWS for 14.4.2

Author: eddelbuettel

inst/NEWS.Rd

@@ -6,6 +6,10 @@
 \section{Changes in RcppArmadillo version 14.4.2-1 (2025-04-25)}{
   \itemize{
     \item Upgraded to Armadillo release 14.4.2 (Filtered Espresso)
+    \itemize{
+      \item Fix for \code{expmat()}
+      \item Workaround for bugs in clang 20 compiler
+    }
     \itemize{
       \item Micro-cleanup in one test file
     }