fix warning NU1701

[filzrev]

Fix warnings occurred when following conditions met.

• Using Microsoft.DocAsCode.App NuGet package
• TargetFramework is net6.0.

Warnings Messages

Warning NU1701 Package 'Microsoft.Build 17.6.3' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net6.0'. This package may not be fully compatible with your project.

Warning NU1701 Package 'Microsoft.IO.Redist 6.0.0' was restored using '.NETFramework,Version=v4.6.1, .NETFramework,Version=v4.6.2, .NETFramework,Version=v4.7, .NETFramework,Version=v4.7.1, .NETFramework,Version=v4.7.2, .NETFramework,Version=v4.8, .NETFramework,Version=v4.8.1' instead of the project target framework 'net6.0'. This package may not be fully compatible with your project.

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.01 ⚠️

Comparison is base (12f3998) 77.00% compared to head (4b2104e) 76.99%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8904      +/-   ##
==========================================
- Coverage   77.00%   76.99%   -0.01%     
==========================================
  Files         605      605              
  Lines       25036    25036              
==========================================
- Hits        19278    19277       -1     
- Misses       5758     5759       +1     

see 1 file with indirect coverage changes

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[yufeih]

Thank you @filzrev