[CHANGE] Use django-sri for sri hashes

[ppfeufer]

Description

Changed

• Use django-sri for sri hashes
• Minimum requirements
  • Alliance Auth >= 4.6.0

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented on my code, particularly in hard-to-understand areas
• I have checked my code and corrected any misspellings

[codecov]

Codecov Report

Attention: Patch coverage is 89.74359% with 4 lines in your changes missing coverage. Please review.

Project coverage is 68.79%. Comparing base (15d8eae) to head (971284a).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
sovtimer/templatetags/sovtimer.py	83.34%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #158      +/-   ##
==========================================
+ Coverage   66.67%   68.79%   +2.12%     
==========================================
  Files          12       13       +1     
  Lines         312      346      +34     
  Branches       28       31       +3     
==========================================
+ Hits          208      238      +30     
- Misses         99      101       +2     
- Partials        5        7       +2     

Files with missing lines	Coverage Δ
sovtimer/constants.py	100.00% <100.00%> (ø)
sovtimer/helper/static_files.py	100.00% <100.00%> (ø)
sovtimer/templatetags/sovtimer.py	85.19% <83.34%> (-14.81%)	⬇️

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