Fix tests that broke during the junit 5 update (#9757)

Co-authored-by: Jason Penilla <11360596+jpenilla@users.noreply.github.com>

patches/server/0003-Build-system-changes.patch

@@ -9,7 +9,7 @@ public net.minecraft.server.packs.VanillaPackResourcesBuilder safeGetPath(Ljava/
 Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
 
 diff --git a/build.gradle.kts b/build.gradle.kts
-index 398df317e5a84e8916a86209e10c127e23bdd563..09bd31c939125f97d7e9ebb2b0376af70a035ab0 100644
+index 813e9019e5bd487edfbb7a52592f979419fee0b5..0ced1beb116b1dc43a79415aa154d32cb22d23d0 100644
 --- a/build.gradle.kts
 +++ b/build.gradle.kts
 @@ -9,10 +9,9 @@ plugins {
@@ -81,8 +81,8 @@ index 398df317e5a84e8916a86209e10c127e23bdd563..09bd31c939125f97d7e9ebb2b0376af7
 +
  tasks.test {
      exclude("org/bukkit/craftbukkit/inventory/ItemStack*Test.class")
- }
-@@ -132,7 +153,14 @@ tasks.registerRunTask("runReobf") {
+     useJUnitPlatform()
+@@ -133,7 +154,14 @@ tasks.registerRunTask("runReobf") {
      classpath(runtimeClasspathWithoutVanillaServer)
  }