remove RedisDsn.user_required = True

[samuelcolvin]

Related issue number

replace #1302, fix #1275

Checklist

• Unit tests for the changes exist
• Tests pass on CI and coverage remains at 100%
• Documentation reflects the changes where applicable
• changes/<pull request or issue id>-<github username>.md file added

[codecov]

Codecov Report

Merging #1658 into master will decrease coverage by 0.05%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##            master    #1658      +/-   ##
===========================================
- Coverage   100.00%   99.94%   -0.06%     
===========================================
  Files           21       21              
  Lines         3795     3794       -1     
  Branches       753      753              
===========================================
- Hits          3795     3792       -3     
- Misses           0        1       +1     
- Partials         0        1       +1     

Impacted Files	Coverage Δ
pydantic/networks.py	99.21% <ø> (-0.79%)	⬇️

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