[release/3.0] Update .NET Runtimes to latest version

[github-actions]

Backport of #6964 to release/3.0

/cc @ericstj

Test only infrastructure change.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (9e500a5) 68.80% compared to head (8bd2265) 68.80%.

Additional details and impacted files

@@               Coverage Diff               @@
##           release/3.0    #6967      +/-   ##
===============================================
- Coverage        68.80%   68.80%   -0.01%     
===============================================
  Files             1240     1240              
  Lines           249652   249652              
  Branches         25511    25511              
===============================================
- Hits            171776   171773       -3     
- Misses           71276    71278       +2     
- Partials          6600     6601       +1     

Flag	Coverage Δ
Debug	68.80% <ø> (-0.01%)	⬇️
production	63.27% <ø> (-0.01%)	⬇️
test	88.41% <ø> (ø)

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see 3 files with indirect coverage changes

[ericstj]

New failure mode showing up in Ubuntu test build:

[Long Running Test] 'Microsoft.ML.Tests.Scenarios.Api.CookbookSamples.CookbookSamplesDynamicApi.TextFeaturization', Elapsed: 00:58:11
[Long Running Test] 'Microsoft.ML.Tests.Transformers.WordEmbeddingsTests.TestWordEmbeddings', Elapsed: 00:58:08

Could there be a deadlock between these two? On my machine they finish in under a minute.