ref: SentryThread change to nullable

[philipphofmann]

Change _Nullable to nullable for SentryThread.

#skip-changelog

[codecov]

Codecov Report

Merging #2704 (eb76c31) into main (72c650a) will increase coverage by 1.40%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2704      +/-   ##
==========================================
+ Coverage   79.15%   80.55%   +1.40%     
==========================================
  Files         247      247              
  Lines       22921    22936      +15     
  Branches     9949    10159     +210     
==========================================
+ Hits        18142    18477     +335     
+ Misses       4307     3995     -312     
+ Partials      472      464       -8     

Impacted Files	Coverage Δ
Sources/Sentry/SentryTracer.m	97.29% <0.00%> (ø)
Sources/Sentry/SentryScreenshot.m	73.52% <0.00%> (ø)
Sources/Sentry/NSDictionary+SentrySanitize.m	100.00% <0.00%> (ø)
Sources/Sentry/SentryCrashIntegration.m	98.66% <0.00%> (+0.03%)	⬆️
...rces/SentryCrash/Recording/Tools/SentryCrashObjC.c	54.72% <0.00%> (+0.10%)	⬆️
...SentryCrash/Recording/Tools/SentryCrashJSONCodec.c	83.07% <0.00%> (+0.23%)	⬆️
Sources/Sentry/SentryCrashReportConverter.m	93.93% <0.00%> (+0.25%)	⬆️
Sources/SentryCrash/Recording/SentryCrash.m	76.23% <0.00%> (+0.28%)	⬆️
...h/Recording/Monitors/SentryCrashMonitor_AppState.c	80.13% <0.00%> (+0.33%)	⬆️
Sources/Sentry/SentryUIViewControllerSwizzling.m	56.72% <0.00%> (+0.36%)	⬆️
... and 23 more

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