Release v6.22.3

[nickdowell]

Bug fixes

• Fix a crash that could occur when reporting internal errors during +[Bugsnag start].
  #1474

• Fix accuracy of isLR and isPC stack frame values.
  #1470

[github-actions]

Bugsnag.framework binary size decreased by 10,168 bytes from 768,248 to 758,080 🎉

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