Drop deprecated SubProcess apply overload

main-actions/src/main/scala/sbt/Tests.scala

@@ -110,10 +110,6 @@ object Tests {
 
   /** Configures a group of tests to be forked in a new JVM with forking options specified by `config`. */
   final case class SubProcess(config: ForkOptions) extends TestRunPolicy
-  object SubProcess {
-    @deprecated("Construct SubProcess with a ForkOptions argument.", "0.13.0")
-    def apply(javaOptions: Seq[String]): SubProcess = SubProcess(ForkOptions(runJVMOptions = javaOptions))
-  }
 
   /** A named group of tests configured to run in the same JVM or be forked. */
   final case class Group(name: String, tests: Seq[TestDefinition], runPolicy: TestRunPolicy)

sbt/src/sbt-test/tests/empty/build.sbt

@@ -4,6 +4,7 @@ testGrouping := {
     new Tests.Group(
       name = test.name,
       tests = Seq(test),
-      runPolicy = Tests.SubProcess(javaOptions = Seq.empty[String]))
+      runPolicy = Tests.SubProcess(ForkOptions(runJVMOptions = Seq.empty[String]))
+    )
   }
 }

sbt/src/sbt-test/tests/fork/build.sbt

@@ -16,7 +16,11 @@ lazy val root = (project in file(".")).
       val tests = (definedTests in Test).value
       assert(tests.size == 3)
       for (idx <- 0 until groups) yield
-        new Group(groupId(idx), tests, SubProcess(Seq("-Dgroup.prefix=" + groupPrefix(idx))))
+        new Group(
+          groupId(idx),
+          tests,
+          SubProcess(ForkOptions(runJVMOptions = Seq("-Dgroup.prefix=" + groupPrefix(idx))))
+        )
     },
     check := {
       val files =