Revert "remove md5 password_hasher to messure speedup"

This reverts commit 977f5df.

.github/workflows/django.yml

@@ -31,6 +31,7 @@ jobs:
         python -m pip install --upgrade pip
         pip install coveralls
         pip install -r requirements.txt
+        echo "PASSWORD_HASHERS = ['django.contrib.auth.hashers.MD5PasswordHasher',]" >> src/settings.py
 
     - name: Static tests
       env: