Remove DiagnosticSource reference from Extensions for NET 6.0 and later

[lahma]

Pull Request

The issue or feature being addressed

Just a small trimming to dependencies as NET6+ does not need explicit reference to System.Diagnostics.DiagnosticSource

Details on the issue fix or feature implementation

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature
• I have successfully run a local build

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.67%. Comparing base (785c482) to head (fc1f143).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2033      +/-   ##
==========================================
- Coverage   83.70%   83.67%   -0.03%     
==========================================
  Files         312      312              
  Lines        7105     7105              
  Branches     1054     1054              
==========================================
- Hits         5947     5945       -2     
- Misses        788      789       +1     
- Partials      370      371       +1     

Flag	Coverage Δ
linux	83.67% <ø> (-0.03%)	⬇️
macos	83.67% <ø> (ø)
windows	?

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.