update django and related packages

requirements/base.txt

@@ -1,17 +1,17 @@
-pytz==2020.1  # https://github.com/stub42/pytz
-python-slugify==3.0.6 # https://github.com/un33k/python-slugify
-Pillow==7.2.0  # https://github.com/python-pillow/Pillow
-argon2-cffi==20.1.0  # https://github.com/hynek/argon2_cffi
+pytz==2021.3  # https://github.com/stub42/pytz
+python-slugify==5.0.2 # https://github.com/un33k/python-slugify
+Pillow==9.0.0  # https://github.com/python-pillow/Pillow
+argon2-cffi==21.3.0  # https://github.com/hynek/argon2_cffi
 whitenoise==5.2.0
-redis==3.5.3  # https://github.com/andymccurdy/redis-py
-hiredis==1.1.0  # https://github.com/redis/hiredis-py
-celery==4.4.6 # pyup: < 5.0,!=4.4.7  # https://github.com/celery/celery
-django-celery-beat==2.0.0
-flower==0.9.5  # https://github.com/mher/flower
+redis==4.1.1  # https://github.com/andymccurdy/redis-py
+hiredis==2.0.0  # https://github.com/redis/hiredis-py
+celery==5.2.3 # pyup: < 5.0,!=4.4.7  # https://github.com/celery/celery
+django-celery-beat==2.6.0
+flower==1.0.0  # https://github.com/mher/flower
 
 # Django
 # ------------------------------------------------------------------------------
-django==3.1.3  # # https://www.djangoproject.com/
+django==4.2.13  # # https://www.djangoproject.com/
 django-environ==0.4.5  # https://github.com/joke2k/django-environ
 django-model-utils==4.0.0  # https://github.com/jazzband/django-model-utils
 django-allauth==0.42.0  # https://github.com/pennersr/django-allauth