Update dependency es6-promise to v4.2.8

Author: renovate[bot]

package.json

@@ -51,7 +51,7 @@
 	},
 	"dependencies": {
 		"dom-storage": "2.1.0",
-		"es6-promise": "4.2.6",
+		"es6-promise": "4.2.8",
 		"lodash": "4.17.21",
 		"request": "2.88.2",
 		"xlsx": "0.18",

yarn.lock

@@ -1088,10 +1088,10 @@ es6-iterator@^2.0.1, es6-iterator@^2.0.3:
     es5-ext "^0.10.35"
     es6-symbol "^3.1.1"
 
-[email protected].6:
-  version "4.2.6"
-  resolved "https://registry.npmjs.org/es6-promise/-/es6-promise-4.2.6.tgz"
-  integrity sha512-aRVgGdnmW2OiySVPUC9e6m+plolMAJKjZnQlCwNSuK5yQ0JN61DZSO1X1Ufd1foqWRAlig0rhduTCHe7sVtK5Q==
+[email protected].8:
+  version "4.2.8"
+  resolved "https://registry.yarnpkg.com/es6-promise/-/es6-promise-4.2.8.tgz#4eb21594c972bc40553d276e510539143db53e0a"
+  integrity sha512-HJDGx5daxeIvxdBxvG2cb9g4tEvwIk3i8+nhX0yGrYmZUzbkdg8QbDevheDB8gd0//uPj4c1EQua8Q+MViT0/w==
 
 es6-symbol@^3.1.1, es6-symbol@^3.1.3:
   version "3.1.3"