test(coverlet): bump version 8

[ArgoZhang]

Link issues

fixes #7876

Summary By Copilot

Regression?

• Yes
• No

Risk

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• Medium
• Low

Verification

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• Automated

Packaging changes reviewed?

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☑️ Self Check before Merge

⚠️ Please check all items below before review. ⚠️

• Doc is updated/provided or not needed
• Demo is updated/provided or not needed
• Merge the latest code from the main branch

Summary by Sourcery

Build:

• Update test project build configuration to use Coverlet version 8 for code coverage.

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[Copilot]

Pull request overview

Updates the test infrastructure dependency for code coverage collection by bumping coverlet.collector to the 8.* version range, aligning test runs that use --collect:"XPlat Code Coverage" with the newer major release.

Changes:

• Bump coverlet.collector from 6.* to 8.* in the shared test Directory.Build.props.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (9adeb01) to head (6af5461).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main     #7877   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files          764       764           
  Lines        34162     34162           
  Branches      4703      4700    -3     
=========================================
  Hits         34162     34162           

Flag	Coverage Δ
BB	100.00% <ø> (?)

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