Perform Dependency Upgrades and System Fixes

[mariobehling]

Perform the following upgrades and maintenance

• [ ] Replace slimit with https://pypi.org/project/rjsmin/
• [ ] Upgrade jQuery
• [ ] PDF: Upgrade fabric.js
• [ ] Upgrade package-lock to v2
• [ ] Get rid of unmaintained dependency python-u2flib-server
• [ ] Upgrade NodeJS
• [ ] Improve npm install call in pyproject.toml (previously setup.py)
• [ ] Update webauthn requirement from to ==2.0
• [ ] Update django-oauth-toolkit requirement to ==2.3.
• [ ] Upgrade celery to 5.4.*
• [ ] chardet to 5.2.*
• [ ] css-inline to 0.14.*
• [ ] django-bootstrap3 to 24.2
• [ ] django-compressor to 4.5
• [ ] django-countries to 7.6.*
• [ ] django-filter to 24.2
• [ ] django-formtools to 2.5.1
• [ ] django-hierarkey to 1.2.*
• [ ] django-hijack 3.5.*
• [ ] django-otp 1.5.*
• [ ] django-phonenumber-field 7.3.*
• [ ] django-statici18n 2.5.*
• [ ] djangorestframework 3.15.*
• [ ] importlib_metadata 8.*
• [ ] libsass 0.23.*
• [ ] markdown 3.6
• [ ] Pillow 10.3.*
• [ ] protobuf 5.27.*
• [ ] pycparser 2.22
• [ ] python-dateutil 2.9.*
• [ ] reportlab 4.2.*
• [ ] stripe 7.9.*
• [ ] tqdm 4.66.*
• [ ] webauthn 2.2.*
• [ ] fakeredis 2.23.*
• [ ] flake8 7.1.*
• [ ] isort 5.13.*
• [ ] pep8-naming 0.14.*
• [ ] pytest 8.2.*
• [ ] pytest-mock 3.14.*
• [ ] pytest-rerunfailures 14.*
• [ ] pytest-xdist 3.6.*
• [x] Keep dependencies in one place
• [x] Upgrade mt-940
• [x] Upgrade django-phonenumber-field
• [x] PDF: replace deprecated PdfMerger with PdfWriter
• [x] PDF: Upgrade PyPDF