[extensions.aws & sampler.aws] Mitigate STJ vulnerabilities

[CodeBlanch]

Changes

• Mitigate security vulnerabilities in more projects which are today targeting System.Text.Json v6.0.0.
• In OpenTelemetry.Sampler.AWS reference System.Net.Http directly on net462 and drop package reference. Not related to vulnerability just making it consistent with the rest of the repo.

Details

OpenTelemetry.Extensions.AWS

Before

Target	Direct reference	Version	Vulnerable
net462	Yes	6.0.0	Yes
net8.0	No	8.0.0 - 8.0.5	Depends on installed runtime patch level
netstandard2.0	Yes	6.0.0	Yes

After

Target	Direct reference	Version	Vulnerable
net462	Yes	6.0.10	No
net8.0	Yes	8.0.5	No
netstandard2.0	Yes	6.0.10	No

OpenTelemetry.Sampler.AWS

Before

Target	Direct reference	Version	Vulnerable
net462	Yes	6.0.0	Yes
net8.0	No	8.0.0 - 8.0.5	Depends on installed runtime patch level
netstandard2.0	Yes	6.0.0	Yes

After

Target	Direct reference	Version	Vulnerable
net462	Yes	6.0.10	No
net8.0	Yes	8.0.5	No
netstandard2.0	Yes	6.0.10	No

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.45%. Comparing base (71655ce) to head (73a1703).
Report is 523 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2197      +/-   ##
==========================================
+ Coverage   73.91%   77.45%   +3.53%     
==========================================
  Files         267       26     -241     
  Lines        9615     1233    -8382     
==========================================
- Hits         7107      955    -6152     
+ Misses       2508      278    -2230     

Flag	Coverage Δ
unittests-Extensions	88.63% <ø> (?)
unittests-Extensions.AWS	83.41% <ø> (?)
unittests-Instrumentation.Http	73.57% <ø> (?)

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

see 279 files with indirect coverage changes