fix(deps): update dependency buffer to v6

Author: renovate[bot]

package.json

@@ -37,7 +37,7 @@
 	"dependencies": {
 		"assert": "^2.1.0",
 		"browserify-zlib": "^0.2.0",
-		"buffer": "^5.7.1",
+		"buffer": "^6.0.3",
 		"console-browserify": "^1.2.0",
 		"constants-browserify": "^1.0.0",
 		"crypto-browserify": "^3.12.1",