NLog v6 RC2

[snakefoot]

Upgrade to NLog v6.0 RC2 and updated to use nullable references.

Resolves #540

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 57.37705% with 130 lines in your changes missing coverage. Please review.

Project coverage is 77.57%. Comparing base (5caec9d) to head (0a3a6e5).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/NLog.Extensions.Logging/Logging/NLogLogger.cs	48.17%	67 Missing and 18 partials ⚠️
...Extensions.Logging/Logging/NLogBeginScopeParser.cs	60.56%	19 Missing and 9 partials ⚠️
...tensions.Logging/Targets/MicrosoftILoggerTarget.cs	58.33%	1 Missing and 4 partials ⚠️
...ensions.Logging/Config/NLogLoggingConfiguration.cs	75.00%	0 Missing and 4 partials ⚠️
...tensions.Hosting/Extensions/ConfigureExtensions.cs	40.00%	1 Missing and 2 partials ⚠️
...nsions.Logging/Logging/NLogMessageParameterList.cs	86.66%	1 Missing and 1 partial ⚠️
...tensions.Logging/Extensions/ConfigureExtensions.cs	83.33%	1 Missing ⚠️
...ing/LayoutRenderers/ConfigSettingLayoutRenderer.cs	83.33%	0 Missing and 1 partial ⚠️
.../LayoutRenderers/MicrosoftConsoleLayoutRenderer.cs	75.00%	0 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #784      +/-   ##
==========================================
- Coverage   81.21%   77.57%   -3.64%     
==========================================
  Files          19       19              
  Lines        1826     1958     +132     
  Branches      325      374      +49     
==========================================
+ Hits         1483     1519      +36     
- Misses        206      278      +72     
- Partials      137      161      +24     

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