ref: tunnel reduced supported tfms

[bruno-garcia]

Refactors #1133

[github-actions]

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- tunnel reduced supported tfms([#1140](https://github.com/getsentry/sentry-dotnet/pull/1140))

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Generated by 🚫 dangerJS against 1b5ad60

[codecov-commenter]

Codecov Report

Merging #1140 (1b5ad60) into main (a0b454b) will decrease coverage by 0.19%.
The diff coverage is 58.62%.

@@            Coverage Diff             @@
##             main    #1140      +/-   ##
==========================================
- Coverage   80.79%   80.59%   -0.20%     
==========================================
  Files         200      203       +3     
  Lines        6617     6674      +57     
  Branches     1465     1476      +11     
==========================================
+ Hits         5346     5379      +33     
- Misses        800      816      +16     
- Partials      471      479       +8     

Impacted Files	Coverage Δ
.../Sentry.Extensions.Logging/SentryLoggerProvider.cs	97.36% <ø> (ø)
src/Sentry.Tunnel/SentryTunnelMiddleware.cs	47.61% <47.61%> (ø)
src/Sentry/Internal/SentryJsonConverter.cs	75.00% <75.00%> (ø)
...nel/SentryTunnelingApplicationBuilderExtensions.cs	100.00% <100.00%> (ø)
src/Sentry/Internal/Extensions/JsonExtensions.cs	76.47% <100.00%> (+0.63%)	⬆️
src/Sentry/Internal/BackgroundWorker.cs	84.24% <0.00%> (-0.69%)	⬇️
src/Sentry/GlobalSessionManager.cs	71.20% <0.00%> (+0.38%)	⬆️

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