Fix WebHookService spec failing in Ruby 2.6
Ruby 2.6 changed Net::ReadTimeout#message to include the reason for the socket error (https://bugs.ruby-lang.org/issues/14832). However, WebHookService was failing in Ruby 2.6 because it expected Exception#message to match Exception#to_s, which isn't always the case. Fix this by just checking Exception#to_s.
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