adding comment why to enforce flask 2

.github/workflows/tests.yml

@@ -37,8 +37,8 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         pip install pytest
-        pip install Werkzeug==2.0.2
-        pip install flask==2.0.2
+        # sending files in form data throwing error in flask 3 while running tests
+        pip install Werkzeug==2.0.2 flask==2.0.2
         pip install .
         
     - name: Test with pytest