Update all microsoft dependencies to v6.0.20

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
Microsoft.AspNetCore.Identity.EntityFrameworkCore (source)	nuget	patch	6.0.19 -> 6.0.20
Microsoft.AspNetCore.MiddlewareAnalysis (source)	nuget	patch	6.0.19 -> 6.0.20
Microsoft.AspNetCore.Mvc.NewtonsoftJson (source)	nuget	patch	6.0.19 -> 6.0.20
Microsoft.AspNetCore.Mvc.Testing (source)	nuget	patch	6.0.19 -> 6.0.20
Microsoft.EntityFrameworkCore (source)	nuget	patch	6.0.19 -> 6.0.20
Microsoft.EntityFrameworkCore.InMemory (source)	nuget	patch	6.0.19 -> 6.0.20
Microsoft.EntityFrameworkCore.Relational (source)	nuget	patch	6.0.19 -> 6.0.20

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[codecov]

Codecov Report

Merging #1417 (697a463) into main (d15f1d8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1417   +/-   ##
=======================================
  Coverage   21.24%   21.24%           
=======================================
  Files         136      136           
  Lines        4325     4325           
  Branches      464      464           
=======================================
  Hits          919      919           
- Misses       3303     3305    +2     
+ Partials      103      101    -2     

see 2 files with indirect coverage changes

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

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[github-actions]

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