Release v6.25.2

[kstenerud]

Bug fixes

• Workaround for thermal state lock re-entry bug on iOS 15.0.2-15.1.1.
  1514

• Clean up compiler warnings about data races and nullability.
  1515

[github-actions]

Bugsnag.framework binary size increased by 400 bytes from 706,296 to 706,696

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.1%    +276  +0.1%    +276    __TEXT,__text
  +0.1%    +200  +0.1%    +200    String Table
  +0.2%    +192  +0.2%    +192    Symbol Table
  +1.0%     +32  +1.0%     +32    __DATA,__const
  +0.5%      +8  +0.5%      +8    Function Start Addresses
  +0.1%      +4  +0.1%      +4    __TEXT,__unwind_info
  -0.4%     -32  -0.2%     -32    [__DATA]
  -1.1%    -280  -1.1%    -280    [__TEXT]
  [ = ]       0  -2.7%    -400    [__LINKEDIT]
  +0.1%    +400  [ = ]       0    TOTAL

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