Release v6.27.3

[kstenerud]

Bug fixes

• Remove include directives from inside of extern "C" sections because newer Xcode versions have issues with it
  1608

• Setting user fields to nil will now clear them fully.
  1599

• Crash fix: Detect and handle when WatchOS is running as an app rather than an extension.
  1588

• Removed deprecated NXArchInfo code that was causing build issues.
  1584

• Removed deprecated syscall on macos that was causing build issues.
  1577

• Check app version to avoid detecting an app upgrade as an OOM
  1597

[github-actions]

Bugsnag.framework binary size increased by 184 bytes from 713,304 to 713,488

    FILE SIZE        VM SIZE    
 --------------  -------------- 
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   +25%    +224   +25%    +224    __DATA,__data
  +0.1%    +112  +0.1%    +112    String Table
  +0.1%     +96  +0.1%     +96    Symbol Table
  [ = ]       0  +0.7%     +64    __DATA,__bss
  +0.2%     +32  +0.2%     +32    __DATA,__cfstring
  +0.2%     +32  +0.2%     +32    __TEXT,__objc_methname
  +0.2%     +30  +0.2%     +30    __TEXT,__cstring
  +0.1%     +24  +0.1%     +24    __DATA,__objc_const
  +0.3%     +16  +0.3%     +16    __DATA,__objc_selrefs
  +0.4%      +8  +0.4%      +8    Rebase Info
  -0.1%      -4  -0.1%      -4    [2 Others]
  -0.5%      -8  -0.5%      -8    Indirect Symbol Table
  [ = ]       0  [DEL]      -8    __DATA,__common
  -0.6%     -12  -0.6%     -12    __TEXT,__stub_helper
  -0.6%     -12  -0.6%     -12    __TEXT,__stubs
  -0.6%     -24  -0.6%     -24    Lazy Binding Info
  -2.3%     -80  -2.3%     -80    [Mach-O Headers]
  [ = ]       0  -2.4%    -184    [__LINKEDIT]
  -4.1%    -288  -2.5%    -344    [__DATA]
  -4.3%    -834  -4.3%    -834    [__TEXT]
  +0.0%    +184  [ = ]       0    TOTAL

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