deps: Replace bleach by nh3

[nijel]

Proposed changes

Bleach is getting deprecated and nh3 is way faster.

This is not yet ready, needs messense/nh3#8

Bleach depreciation notice: mozilla/bleach#698

Checklist

• Lint and unit tests pass locally with my changes.
• I have added tests that prove my fix is effective or that my feature works.
• I have added documentation to describe my feature.
• I have squashed my commits into logic units.
• I have described the changes in the commit messages.

Other information

[codecov]

Codecov Report

Merging #8664 (f612676) into main (ab9fd58) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8664      +/-   ##
==========================================
- Coverage   90.85%   90.84%   -0.01%     
==========================================
  Files         700      700              
  Lines       52174    52174              
  Branches     7935     7935              
==========================================
- Hits        47402    47399       -3     
- Misses       3332     3334       +2     
- Partials     1440     1441       +1     

Impacted Files	Coverage Δ
weblate/trans/tests/test_autofix.py	100.00% <ø> (ø)
weblate/utils/requirements.py	71.95% <ø> (ø)
weblate/checks/markup.py	96.51% <100.00%> (ø)
weblate/trans/autofixes/html.py	100.00% <100.00%> (ø)
weblate/utils/html.py	100.00% <100.00%> (ø)
weblate/utils/tests/test_html.py	100.00% <100.00%> (ø)
weblate/utils/requests.py	86.11% <0.00%> (-8.34%)	⬇️