Deprecate useJCenter key

main/src/main/scala/sbt/Defaults.scala

@@ -3032,6 +3032,7 @@ object Classpaths {
     publishM2 := publishOrSkip(publishM2Configuration, publishM2 / skip).value
   )
 
+  @nowarn("cat=deprecation")
   private[this] def baseGlobalDefaults =
     Defaults.globalDefaults(
       Seq(
@@ -3102,6 +3103,7 @@ object Classpaths {
       )
     )
 
+  @nowarn("cat=deprecation")
   val ivyBaseSettings: Seq[Setting[_]] = baseGlobalDefaults ++ sbtClassifiersTasks ++ Seq(
     conflictWarning := conflictWarning.value.copy(label = Reference.display(thisProjectRef.value)),
     unmanagedBase := baseDirectory.value / "lib",

main/src/main/scala/sbt/Keys.scala

@@ -530,6 +530,7 @@ object Keys {
   val otherResolvers = taskKey[Seq[Resolver]]("Resolvers not included in the main resolver chain, such as those in module configurations.").withRank(CSetting)
   val scalaCompilerBridgeResolvers = taskKey[Seq[Resolver]]("Resolvers used to resolve compiler bridges.").withRank(CSetting)
   val includePluginResolvers = settingKey[Boolean]("Include the resolvers from the metabuild.").withRank(CSetting)
+  @deprecated("JCenter has sunset", "1.10.4")
   val useJCenter = settingKey[Boolean]("Use JCenter as the default repository.").withRank(CSetting)
   val moduleConfigurations = settingKey[Seq[ModuleConfiguration]]("Defines module configurations, which override resolvers on a per-module basis.").withRank(BMinusSetting)
   val retrievePattern = settingKey[String]("Pattern used to retrieve managed dependencies to the current build.").withRank(DSetting)