remove django-braces dependency #2709

[phillxnet]

Remove now defunct django-braces dependency. Likely left over from a prior requirement.

Includes

• Incidental/unrelated update to urllib3 2.0.6 to 2.0.7.

Fixes #2709

[phillxnet]

Testing

Actually unrelated to PR as there is no known use of this library. Noting just as a quick current-state of capability.

CLI test run:

lbuildvm:~ # cd /opt/rockstor/src/rockstor/
lbuildvm:/opt/rockstor/src/rockstor # export DJANGO_SETTINGS_MODULE=settings
lbuildvm:/opt/rockstor/src/rockstor # poetry run django-admin test -v 2
...
----------------------------------------------------------------------
Ran 262 tests in 26.129s

OK

An RPM was successfully built and installed with this match pre-merged. The resulting instance was able to:

• Initiate via the Web-UI setup.
• Install all pending upstream base OS update.

127.0.0.1 - - [18/Oct/2023:18:18:46 +0100] "POST /api/commands/update HTTP/1.1" 200 6 "-" "python-requests/2.31.0" 120145ms

• Import a pool.
• Configure Rock-ons system.
• Install and run the netdata Rock-on.
• Stop and remove Rock-on.
• Stop Rock-ons service.
• Collect and present in Web-UI a drives SMART data.
• Create share.
• Export share via SMB.
• Remove export.
• Remove share.
• Turn off SMB servcie.
• Create scheduled task to snap.
• Remove scheduled task.
• Remove snapshots.
• add new user.
• remove new user.

[phillxnet]

@FroggyFlox & @Hooverdan96 I'll pop this in as I'm pretty sure, bar the incidental urllib3 minor update, we have no actual change here. It seems this was a ghost import that I failed to appreciate until our current run on dependency re-examination/update-run!