[Deps] update inherits, safe-buffer

Author: ljharb

package.json

@@ -8,8 +8,8 @@
     "url": "git://github.com/crypto-browserify/sha.js.git"
   },
   "dependencies": {
-    "inherits": "^2.0.1",
-    "safe-buffer": "^5.0.1"
+    "inherits": "^2.0.4",
+    "safe-buffer": "^5.2.1"
   },
   "devDependencies": {
     "buffer": "^2.8.3",