Fix MiMa issue

Author: noti0na1

library/src/scala/collection/convert/JavaCollectionWrappers.scala

@@ -526,7 +526,7 @@ private[collection] object JavaCollectionWrappers extends Serializable {
     def isEmpty: Boolean = underlying.isEmpty
     def keys: ju.Enumeration[K] = underlying.keysIterator.asJavaEnumeration
     def elements: ju.Enumeration[V] = underlying.valuesIterator.asJavaEnumeration
-    def get(key: AnyRef) = try {
+    def get(key: AnyRef): V = try {
       underlying get key.asInstanceOf[K] match {
         case None => null.asInstanceOf[V]
         case Some(v) => v
@@ -538,7 +538,7 @@ private[collection] object JavaCollectionWrappers extends Serializable {
       case Some(v) => v
       case None => null.asInstanceOf[V]
     }
-    override def remove(key: AnyRef) = try {
+    override def remove(key: AnyRef): V = try {
       underlying remove key.asInstanceOf[K] match {
         case None => null.asInstanceOf[V]
         case Some(v) => v

project/MiMaFilters.scala

@@ -566,8 +566,6 @@ object MiMaFilters {
 
           // NO IDEA FOR NOW :)
           ProblemFilters.exclude[ReversedMissingMethodProblem]("scala.collection.mutable.ArrayDequeOps.scala$collection$mutable$ArrayDequeOps$$super$sliding"),
-          ProblemFilters.exclude[DirectAbstractMethodProblem]("java.util.Dictionary.get"),
-          ProblemFilters.exclude[DirectAbstractMethodProblem]("java.util.Dictionary.remove"),
         ),
 
       // Breaking changes since last LTS