Bump Django to version 4.2.x with Python 3.9

[f-laurens]

Bump Django to version 4.2.x with Python 3.9.
Note: Django 4.x drops support for Python 3.7 (and hence Buster). So Django 3.2.x is still used with Python 3.7.

Some other requirements also bumped for security fixes.
Note:

• Cannot bump scipy at this point:

# Latest scipy compatible with snips-nlu
scipy==1.6.2

• Cannot bump future at this point:
  snips-nlu 0.20.2.1 depends on future<0.18 and >=0.16

[lgtm-com]

This pull request fixes 3 alerts when merging 9035f1d into 4012a0d - view on LGTM.com

fixed alerts:

• 2 for Wrong number of arguments in a call
• 1 for Uncontrolled command line

[lgtm-com]

This pull request fixes 3 alerts when merging d94d8ae into 4012a0d - view on LGTM.com

fixed alerts:

• 2 for Wrong number of arguments in a call
• 1 for Uncontrolled command line

[pguyot]

Unless I'm mistaken, if we merge this we will break deployed Nabaztags running pynab on Buster (almost everyone except some power users). So we probably should make this PR a draft until we have a working Buster to Bullseye migration procedure.

[f-laurens]

if we merge this we will break deployed Nabaztags running pynab on Buster

This should not break since this still installs Django 3.2.x if Python 3.7 (e.g. Buster); Django 4.2.x is installed only if Python 3.9 (e.g. Bullseye).

[pguyot]

Nice, didn't look deep enough.
However, it means we support two different versions of django...

[f-laurens]

However, it means we support two different versions of django...

Hence my cautious note above that this PR might be suitable only when Pynab drops support for Raspbian (Buster) altogether.

[lgtm-com]

This pull request fixes 3 alerts when merging 39dc94a into 814b6e1 - view on LGTM.com

fixed alerts:

• 2 for Wrong number of arguments in a call
• 1 for Uncontrolled command line

[lgtm-com]

This pull request fixes 3 alerts when merging e7f6b80 into d869ca7 - view on LGTM.com

fixed alerts:

• 2 for Wrong number of arguments in a call
• 1 for Uncontrolled command line

[lgtm-com]

This pull request fixes 2 alerts when merging a0664fb into 629a061 - view on LGTM.com

fixed alerts:

• 1 for Wrong number of arguments in a call
• 1 for Uncontrolled command line

[f-laurens]

Note: zero_raspios and zero2_64_raspios checks will fail till PR #455 is successfully merged.