Update the dotnet codegen import path

[iwahbe]

This is follow-up work for pulumi/pulumi#21638.

[github-actions]

Does the PR have any schema changes?

Looking good! No breaking changes found.
No new resources/functions.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 62.52%. Comparing base (d63ec85) to head (c09a126).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
provider/pkg/gen/examples.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4513   +/-   ##
=======================================
  Coverage   62.52%   62.52%           
=======================================
  Files          90       90           
  Lines       10783    10783           
=======================================
  Hits         6742     6742           
  Misses       3399     3399           
  Partials      642      642           

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[pulumi-bot]

This PR has been shipped in release v3.14.0.