Update bundled gems list at 156da55c16 [ci skip]

NEWS.md

@@ -175,7 +175,7 @@ Note: We're only listing outstanding class updates.
     * net-imap 0.2.3
     * rbs 2.6.0
     * typeprof 0.21.3
-    * debug 1.6.0
+    * debug 1.6.1
 *   The following default gems are now bundled gems.
 
 ## Compatibility issues