Remove duplicate junit-jupiter-api dependency with different version

This fixes exceptions when we try to run JUnit tests directly in IDEA.

Signed-off-by: Graham <gpe@openrs2.dev>

build.gradle.kts

@@ -98,6 +98,11 @@ configure(subprojects.filter { it.free }) {
 
             val testImplementation by configurations
             testImplementation(kotlin("test-junit5"))
+            testImplementation("org.junit.jupiter:junit-jupiter-api") {
+                version {
+                    strictly(Versions.junit)
+                }
+            }
         }
     }