Add default_applicable_licenses to lib package.

This is to satisfy some license compliance policies within Google.

PiperOrigin-RevId: 538251455
diff --git a/lib/BUILD b/lib/BUILD
index 8d612b3..a4d574e 100644
--- a/lib/BUILD
+++ b/lib/BUILD
@@ -17,6 +17,7 @@
 licenses(["notice"])
 
 package(
+    default_applicable_licenses = ["//:package_license"],
     default_visibility = ["//visibility:private"],
 )