Merge pull request #1840 from guardian/vb/gson

Update liveactivities dependencies

Author: vlbee

build.sbt

@@ -487,6 +487,9 @@ lazy val liveactivities = lambda("liveactivities", "liveactivities", Some("com.g
       // Hopefully this workaround can be removed once play-json-extensions either updates to Play 3.0 or is merged into play-json
       ExclusionRule(organization = "com.typesafe.play")
     ),
+    dependencyOverrides ++= Seq(
+        "com.google.code.gson" % "gson" % "2.10.1", // can be removed once pushy is removed.
+    ),
     fork := true,
     startDynamoDBLocal := startDynamoDBLocal.dependsOn(Test / compile).value,
     Test / test := (Test / test).dependsOn(startDynamoDBLocal).value,

project/plugins.sbt

@@ -23,6 +23,8 @@ addSbtPlugin("net.virtual-void" % "sbt-dependency-graph" % "0.10.0-RC1")
 
 addSbtPlugin("ch.epfl.scala" % "sbt-version-policy" % "3.2.1")
 
+addDependencyTreePlugin
+
 /*
    Without setting VersionScheme.Always here on `scala-xml`, sbt 1.8.0 will raise fatal 'version conflict' errors when
    used with sbt plugins like `sbt-native-packager`, which currently use sort-of-incompatible versions of the `scala-xml`