Application is using many old dependencies that need to be updated

When viewing the dependencies of the project, both backend dependencies (`requirements.txt`) and frontend dependencies (`package.json`) I see many packages are still using very old versions, examples:
`gunicorn`: current version 19.6, latest version is 21.2
`redis`: current version 3.5.3, latest version is 5.0.0
`webpack`: current version is 4, latest version is 5
`flow-bin`: current version is 0.75, latest version is 0.215.1
and many others

I plan to contribute to this issue by updating packages one-by-one in separate PRs, that is each PR will upgrade one dependency whether backend or frontend.

We need to upgrade these packages:
- [ ] #1031
- [ ] dj-database-url
- [ ] better to pin Django to 4.2.4
- [ ] django-allauth
- [ ] django-appconf
- [ ] django-compressor
- [ ] django-cors-headers
- [ ] django-debreach
- [ ] django-registration
- [ ] django-rq
- [ ] django-s3direct
- [ ] django-storages
- [ ] django-timezone-field
- [ ] docutils
- [ ] gunicorn
- [ ] jmespath
- [ ] psutil
- [ ] psycopg2 to psycopg 3
- [ ] rcssmin
- [ ] redis
- [ ] requests
- [ ] rq
- [ ] simplejson
- [ ] six
- [ ] whitenoise
And frontend packages:
- [ ] babel packages
- [ ] @svgr/webpack
- [ ] @tryghost/content-api
- [ ] aws-sdk migration to modularized v3
- [ ] remove bluebird
- [ ] core-js
- [ ] css-loader
- [ ] flow-bin
- [ ] jest dependencies
- [ ] webpack and its plugins
- [ ] prettier
- [ ] react to v18
- [ ] react-bootstrap
- [ ] react-datepicker
- [ ] react-file-drop
- [ ] react-helmet
- [ ] react-google-recaptcha
- [ ] react-image-crop
- [ ] react-markdown
- [ ] react-select
- [ ] react-sortablejs
- [ ] regenerator-runtime
- [ ] repeating