[Shims.OpenTracing] Fixes support for byte, short, int, float attributes

[Kielek]

Fixes Codex/security findings. It is not considered as a security fix. Just detected during such scans.

Changes

[Shims.OpenTracing] Fixes support for byte, short, int, float attributes
Technically, package is deprecated, but the fix seems be easy enough to avoid occurrence in the similar scans in the future.

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 88.72%. Comparing base (a1b6e6a) to head (cdb12f3).
⚠️ Report is 11 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7080      +/-   ##
==========================================
- Coverage   88.74%   88.72%   -0.02%     
==========================================
  Files         270      270              
  Lines       12919    12927       +8     
==========================================
+ Hits        11465    11470       +5     
- Misses       1454     1457       +3     

Flag	Coverage Δ
unittests-Project-Experimental	88.69% <100.00%> (+0.24%)	⬆️
unittests-Project-Stable	88.68% <100.00%> (-0.05%)	⬇️
unittests-UnstableCoreLibraries-Experimental	41.31% <100.00%> (+0.10%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/OpenTelemetry.Shims.OpenTracing/SpanShim.cs	85.43% <100.00%> (+5.43%)	⬆️

... and 4 files with indirect coverage changes