chore(server): Remove unnecessary else branch on ArtifactRoutes (#1829)

The when expression is now exhaustive and the compiler can imply that
the else branch is never reached.

This commit removed the useless else branch without changing any
functionality.

Author: LeoColman

jit-binding-server/src/main/kotlin/io/github/typesafegithub/workflows/jitbindingserver/ArtifactRoutes.kt

@@ -84,7 +84,6 @@ private fun Route.getArtifact(
         when (artifact) {
             is TextArtifact -> call.respondText(artifact.data())
             is JarArtifact -> call.respondBytes(artifact.data(), ContentType.parse("application/java-archive"))
-            else -> call.respondNotFound()
         }
     }
 }