Deprecate netstandard20

[bhnaphade]

Proposed changes

Describe the changes here to communicate to the maintainers why we should accept this pull request. If it fixes a bug or resolves a feature request, be sure to link to that issue.

Related Issues

• Fixes #

Types of changes

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• Bugfix (non-breaking change which fixes an issue)
• Enhancement (non-breaking change which adds functionality)
• Test enhancement (non-breaking change to increase test coverage)
• Breaking change (fix or feature that would cause existing functionality to not work as expected, requires version increase of Nuget packages)
• Documentation Update (if none of the other choices apply)

Checklist

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• I have read the CONTRIBUTING doc.
• I have signed the CLA.
• I ran tests locally with my changes, all passed.
• I fixed all failing tests in the CI pipelines.
• I fixed all introduced issues with CodeQL and LGTM.
• I have added tests that prove my fix is effective or that my feature works and increased code coverage.
• I have added necessary documentation (if appropriate).
• Any dependent changes have been merged and published in downstream modules.

Further comments

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 53.89%. Comparing base (f91644e) to head (051aea7).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2533      +/-   ##
==========================================
- Coverage   54.08%   53.89%   -0.20%     
==========================================
  Files         334      334              
  Lines       64430    64430              
  Branches    13241    13241              
==========================================
- Hits        34850    34723     -127     
- Misses      25840    25954     +114     
- Partials     3740     3753      +13     

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[mregen]

see comment

[mregen]

see comment