Reduce visibility of Java language constraint

PiperOrigin-RevId: 363831133
Change-Id: Id54f39e680309b2a1506084db3720b6500880a12
diff --git a/java/constraints/BUILD b/java/constraints/BUILD
index fbc5407..5946f95 100644
--- a/java/constraints/BUILD
+++ b/java/constraints/BUILD
@@ -36,7 +36,10 @@
     constraint_setting = ":runtime",
 )
 
-constraint_setting(name = "language")
+constraint_setting(
+    name = "language",
+    visibility = ["//visibility:private"],
+)
 
 # visibility
 constraint_value(