Pin Django version in Django Rest Framework

[lrafeei]

In Django Rest Framework, rest_framework/views.py, from django.utils.cache import cc_delim_re fails to import in Django v6.0.8+

This has been pinned until this bug is fixed on their end.

This PR also drops Python 3.10 from Tornado master tests since 3.10 support has been dropped.

[github-actions]

✅MegaLinter analysis: Success

Descriptor	Linter	Files	Fixed	Errors	Warnings	Elapsed time
✅ ACTION	actionlint	9		0	0	0.86s
✅ MARKDOWN	markdownlint	7	0	0	0	1.22s
✅ PYTHON	ruff	1087	0	0	0	1.0s
✅ PYTHON	ruff-format	1087	0	0	0	0.31s
✅ YAML	prettier	23	0	0	0	1.59s
✅ YAML	v8r	23		0	0	5.38s
✅ YAML	yamllint	23		0	0	0.76s

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.10%. Comparing base (cb5da51) to head (f49e4df).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1814      +/-   ##
==========================================
+ Coverage   82.06%   82.10%   +0.03%     
==========================================
  Files         217      217              
  Lines       26871    26871              
  Branches     4254     4254              
==========================================
+ Hits        22052    22062      +10     
+ Misses       3353     3345       -8     
+ Partials     1466     1464       -2     

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