Bump System.Text.Json to 8.0.4 due to CVE-2024-30105

[Kielek]

Follow up to open-telemetry/opentelemetry-dotnet#5744
Handles GHSA-hh2w-p6rv-4g7w

Changes

Bump System.Text.Json to 8.0.4
It fixes build pipelines. Now, packages referencing System.Text.Json are failing.

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 66.78%. Comparing base (71655ce) to head (001e70a).
Report is 354 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1945      +/-   ##
==========================================
- Coverage   73.91%   66.78%   -7.14%     
==========================================
  Files         267      182      -85     
  Lines        9615     8005    -1610     
==========================================
- Hits         7107     5346    -1761     
- Misses       2508     2659     +151     

Flag	Coverage Δ
unittests-Instrumentation.Http	81.41% <ø> (?)

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see 316 files with indirect coverage changes

[cremor]

FYI: open-telemetry/opentelemetry-dotnet#5744 (comment)