Bump to v2.6.0.beta.1 [ci skip]
Bump to v2.6.0.beta.1 [ci skip]

matrinox/appsignal-ruby,appsignal/appsignal-ruby,appsignal/appsignal-ruby,appsignal/appsignal-ruby,appsignal/appsignal,matrinox/appsignal-ruby,appsignal/appsignal,appsignal/appsignal-ruby,matrinox/appsignal-ruby