Update dependency com.bugsnag:bugsnag-android to v6.8.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.bugsnag:bugsnag-android (source)	6.7.0 -> 6.8.0

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Release Notes

bugsnag/bugsnag-android (com.bugsnag:bugsnag-android)

v6.8.0

Enhancements

• Add original error class and message to metadata for link errors loading BugSnag libraries
  #​2070

Bug fixes

• Sending startup crashes synchronously now uses a flexible timeout so that apps with slower startups don't ANR
  #​2075
  #​2080
• Work around a possible platform NullPointerException when calling Intent.getExtras (https://github.com/bugsnag/bugsnag-android/issues/2082)
  #​2083

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