[Resources.OperatingSystem] Fix issue with detecting MacOS

[ysolomchenko]

Fixes # Fix issue with detecting MacOS

Changes

Fix issue with detecting MacOS

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

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 74.69%. Comparing base (71655ce) to head (c574011).
Report is 364 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1965      +/-   ##
==========================================
+ Coverage   73.91%   74.69%   +0.77%     
==========================================
  Files         267      299      +32     
  Lines        9615    11144    +1529     
==========================================
+ Hits         7107     8324    +1217     
- Misses       2508     2820     +312     

Flag	Coverage Δ
unittests-Exporter.Geneva	64.97% <ø> (?)
unittests-Exporter.InfluxDB	95.88% <ø> (?)
unittests-Exporter.Instana	71.24% <ø> (?)
unittests-Exporter.OneCollector	91.51% <ø> (?)
unittests-Exporter.Stackdriver	75.73% <ø> (?)
unittests-Extensions	86.23% <ø> (?)
unittests-Extensions.AWS	77.24% <ø> (?)
unittests-Extensions.Enrichment	100.00% <ø> (?)
unittests-Instrumentation.AWS	87.56% <ø> (?)
unittests-Instrumentation.AWSLambda	87.96% <ø> (?)
unittests-Instrumentation.AspNetCore	85.27% <ø> (?)
unittests-Instrumentation.ElasticsearchClient	79.87% <ø> (?)
unittests-Instrumentation.EntityFrameworkCore	55.49% <ø> (?)
unittests-Instrumentation.EventCounters	76.36% <ø> (?)
unittests-Instrumentation.GrpcNetClient	79.61% <ø> (?)
unittests-Instrumentation.Hangfire	93.58% <ø> (?)
unittests-Instrumentation.Http	81.41% <ø> (?)
unittests-Instrumentation.Owin	83.43% <ø> (?)
unittests-Instrumentation.Process	100.00% <ø> (?)
unittests-Instrumentation.Quartz	78.94% <ø> (?)
unittests-Instrumentation.Runtime	100.00% <ø> (?)
unittests-Instrumentation.SqlClient	91.89% <ø> (?)
unittests-Instrumentation.StackExchangeRedis	67.02% <ø> (?)
unittests-Instrumentation.Wcf	48.91% <ø> (?)
unittests-PersistentStorage	65.78% <ø> (?)
unittests-Resources.AWS	77.93% <ø> (?)
unittests-Resources.Azure	82.83% <ø> (?)
unittests-Resources.Container	72.41% <ø> (?)
unittests-Resources.Gcp	72.54% <ø> (?)
unittests-Resources.Host	50.00% <ø> (?)
unittests-Resources.OperatingSystem	81.25% <80.00%> (?)
unittests-Resources.Process	100.00% <ø> (?)
unittests-Resources.ProcessRuntime	94.11% <ø> (?)
unittests-Sampler.AWS	87.97% <ø> (?)

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

Files	Coverage Δ
...sources.OperatingSystem/OperatingSystemDetector.cs	78.57% <80.00%> (ø)

... and 311 files with indirect coverage changes