Merge pull request #18009 from boegel/tests_python311

also run easyconfigs test suite with Python 3.11

Author: Micket

.github/workflows/unit_tests.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python: [3.6]
+        python: [3.6, '3.11']
         modules_tool: [Lmod-7.8.22, Lmod-8.6.8]
         module_syntax: [Lua, Tcl]
         # exclude some configurations: only test Tcl module syntax with Lmod 8.x and Python 3.6
@@ -155,7 +155,7 @@ jobs:
     runs-on: ubuntu-20.04
     strategy:
       matrix:
-        python: [3.6]
+        python: [3.6, '3.11']
     steps:
     - uses: actions/checkout@v2