fixed syntax error

.github/workflows/linting.yml

@@ -22,7 +22,8 @@ jobs:
         pip install pylint
         pip install -r ServerCode/requirements.txt
         pip install pytest
-        export PYTHONPATH=$(pwd)/ServerCode
+        cd ServerCode
+        export PYTHONPATH=$(pwd)
     - name: Analysing the code with pylint
       run: |
         # Exclude specific files and suppress warning for method from pylint analysis