Fix synchronization issue on SentryAppender Raven initialization 

[maven-release-plugin] copy for tag v7.8.1 

[maven-release-plugin] copy for tag v7.8.0 

[maven-release-plugin] copy for tag v7.7.1 

[maven-release-plugin] copy for tag v7.7.0 

[maven-release-plugin] copy for tag v7.6.0 

[maven-release-plugin] copy for tag v7.5.0 

[maven-release-plugin] copy for tag v7.4.0 

[maven-release-plugin] copy for tag v7.3.0 

[maven-release-plugin] copy for tag v7.2.3