chore(deps): update dependency js-base64 to v3 (#2582)

Co-authored-by: Renovate Bot <[email protected]>

Author: renovate[bot]

package.json

@@ -117,7 +117,7 @@
     "jest": "^24.0.0",
     "jest-serializer-vue": "^2.0.0",
     "jest-transform-stub": "^2.0.0",
-    "js-base64": "^2.4.8",
+    "js-base64": "^3.0.0",
     "json-templater": "^1.2.0",
     "jsonp": "^0.2.1",
     "less": "^3.9.0",