[repo] Bump tests and examples dependencies

[Kielek]

Changes

Reason, update xunit as in open-telemetry/opentelemetry-dotnet-contrib#1872. Less issues than in contrib repo.
Opportunistic update part of other dependencies.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests ~~added/~~updated
• [ ] Appropriate CHANGELOG.md files updated for non-trivial changes
• [ ] Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.09%. Comparing base (6250307) to head (a29635a).
Report is 257 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5688      +/-   ##
==========================================
+ Coverage   83.38%   86.09%   +2.71%     
==========================================
  Files         297      254      -43     
  Lines       12531    11054    -1477     
==========================================
- Hits        10449     9517     -932     
+ Misses       2082     1537     -545     

Flag	Coverage Δ
unittests	?
unittests-Project-Experimental	85.97% <ø> (?)
unittests-Project-Stable	86.00% <ø> (?)
unittests-Solution	86.02% <ø> (?)
unittests-UnstableCoreLibraries-Experimental	20.13% <ø> (?)

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see 126 files with indirect coverage changes