Release v6.18.1

[nickdowell]

Bug fixes

• Remove device.freeMemory from OOM and Thermal Kill events.
  This indicated the app's remaining quota rather than the device's free memory, so has been removed to avoid confusion.
  #1408

• Fix a crash that could occur in apps that set com.apple.developer.default-data-protection to NSFileProtectionComplete.
  #1407

[github-actions]

Bugsnag.framework binary size increased by 128 bytes from 814,440 to 814,568

    FILE SIZE        VM SIZE    
 --------------  -------------- 
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  +0.2%     +60  +0.2%     +60    __TEXT,__objc_methname
  +0.3%     +59  +0.3%     +59    __TEXT,__cstring
  +1.7%     +48  +1.7%     +48    Binding Info
  +0.0%     +48  +0.0%     +48    String Table
  +0.0%     +32  +0.0%     +32    Symbol Table
  +0.2%     +32  +0.2%     +32    __DATA,__cfstring
  +5.0%     +16  +5.0%     +16    __DATA,__got
  +0.2%     +16  +0.2%     +16    __DATA,__objc_selrefs
  +0.5%      +8  +0.5%      +8    Indirect Symbol Table
  -0.4%      -8  -0.4%      -8    Rebase Info
  -0.7%     -64  -0.4%     -64    [__DATA]
  [ = ]       0  -2.7%    -128    [__LINKEDIT]
  -1.0%    -251  -1.0%    -251    [__TEXT]
  +0.0%    +128  [ = ]       0    TOTAL

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