#310 add failureaccess dependency to shadow jar configuration

Since Guava 27, the failureaccess library is a separate dependency that needs to be included in the shadow jar alongside guava itself. This fixes the ClassNotFoundException for InternalFutureFailureAccess that was occurring in version 2.7.0.

Author: tomix26

build.gradle

@@ -488,6 +488,7 @@ project(':embedded-database-spring-test') {
 
  dependencies {
  include(dependency('com.google.guava:guava'))
+ include(dependency('com.google.guava:failureaccess'))
  }
 
  relocate 'com.google.common', 'io.zonky.test.db.shaded.com.google.common'