treat IO exception as a network issue

[SimonCropp]

fixes #1420

[codecov-commenter]

Codecov Report

Merging #1476 (ab5ad18) into main (945c3d9) will decrease coverage by 1.39%.
The diff coverage is 87.87%.

@@            Coverage Diff             @@
##             main    #1476      +/-   ##
==========================================
- Coverage   84.27%   82.87%   -1.40%     
==========================================
  Files         219      219              
  Lines        7402     7387      -15     
  Branches     1417     1417              
==========================================
- Hits         6238     6122     -116     
- Misses        730      837     +107     
+ Partials      434      428       -6     

Impacted Files	Coverage Δ
src/Sentry/Internal/Http/CachingTransport.cs	82.55% <87.87%> (-0.38%)	⬇️
src/Sentry/PlatformAbstractions/FrameworkInfo.cs	0.00% <0.00%> (-100.00%)	⬇️
...ntry/PlatformAbstractions/RegistryKeyExtensions.cs	0.00% <0.00%> (-100.00%)	⬇️
...Sentry/PlatformAbstractions/FrameworkInfo.NetFx.cs	0.00% <0.00%> (-70.43%)	⬇️
...rmAbstractions/NetFxInstallationsEventProcessor.cs	4.54% <0.00%> (-68.19%)	⬇️
...ntry/PlatformAbstractions/FrameworkInstallation.cs	25.00% <0.00%> (-37.50%)	⬇️
...ntry/Integrations/NetFxInstallationsIntegration.cs	28.57% <0.00%> (-28.58%)	⬇️
src/Sentry/PlatformAbstractions/RuntimeInfo.cs	53.44% <0.00%> (-5.18%)	⬇️
src/Sentry/Internal/BackgroundWorker.cs	92.02% <0.00%> (-1.45%)	⬇️
src/Sentry/Exceptions/SentryStackFrame.cs	80.48% <0.00%> (-1.22%)	⬇️
... and 2 more

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