Bump to v0.8.3 [ci skip]
Bump to v0.8.3 [ci skip]

appsignal/appsignal-ruby,rranelli/appsignal,matrinox/appsignal-ruby,matrinox/appsignal-ruby,appsignal/appsignal-ruby,subvisual/appsignal,matrinox/appsignal-ruby,stijnster/appsignal-ruby,appsignal/appsignal-ruby,stijnster/appsignal-ruby,stijnster/appsignal-ruby,appsignal/appsignal,appsignal/appsignal,appsignal/appsignal-ruby,q-m/appsignal,codefarmdev/haystack