chore: add pytest to requirements.txt for testing dependencies

Author: laurator

.github/workflows/tests.yml

@@ -48,8 +48,6 @@ jobs:
           
     - name: Install dependencies
       run: |
-        python -m pip install --upgrade pip setuptools
-        pip install pytest
         pip install -r requirements.txt
         pip install . # overwrites ncpi python package. It installs the current version of this repository
         

requirements.txt

@@ -1,5 +1,4 @@
 # requirements.txt
 ncpi
-# p7zip-full 
-# wget
+pytest
 # LFPykernels