also test bootstrap script with Python 3.9 (supported since EasyBuild v4.3.1)

Author: boegel

.github/workflows/unit_tests.yml

@@ -170,9 +170,6 @@ jobs:
           test "x$PRINTED_MSG" = "x" || (echo "ERROR: Found printed messages in output of test suite\n${PRINTED_MSG}" && exit 1)
 
     - name: test bootstrap script
-      # skip testing of bootstrap script with Python 3.9,
-      # until an EasyBuild release that is compatible with Python 3.9 is available
-      if: ${{ matrix.python != 3.9 }}
       run: |
           # (re)initialize environment for modules tool
           if [ -f $HOME/moduleshome ]; then export MODULESHOME=$(cat $HOME/moduleshome); fi