use newer mpich

Author: mahf708

.github/workflows/ghci.yaml

@@ -16,7 +16,7 @@ on:
 
 env:
   GCC_VERSION: "11.4.0"
-  MPICH_VERSION: "3.4.3"
+  MPICH_VERSION: "4.2.1"
   SZIP_VERSION: "2.1.1"
   HDF5_VERSION: "1.12.3"
   NETCDFC_VERSION: "4.9.2"