Update bundled gems list at 04fc9f87be [ci skip]

NEWS.md

@@ -50,7 +50,7 @@ The following bundled gems are promoted from default gems.
 * mutex_m 0.2.0
 * getoptlong 0.2.1
 * base64 0.2.0
-* bigdecimal 3.1.6
+* bigdecimal 3.1.7
 * observer 0.1.2
 * abbrev 0.1.2
 * resolv-replace 0.1.1