Run unit tests on an updated version of Modules 4

Environment Modules was updated on EL8 from version 4.1.4 to version
4.5.2+patches which can be assimilated to version 4.5.3.

Seems interesting to update the modules4 version used in unit_tests
CI workflow to match Environment Modules version found in EL8.

.github/workflows/unit_tests.yml

@@ -17,7 +17,7 @@ jobs:
         lmod8: Lmod-8.7.6
         modulesTcl: modules-tcl-1.147
         modules3: modules-3.2.10
-        modules4: modules-4.1.4
+        modules4: modules-4.5.3
     steps:
       - run: "true"
   build: