Update dependency babel-loader to v8.4.1

Author: renovate[bot]

package-lock.json

@@ -59,7 +59,7 @@
     "@types/lodash": "4.17.15",
     "@whitespace/storybook-addon-html": "5.0.0",
     "@wordpress/block-library": "3.2.21",
-    "babel-loader": "8.3.0",
+    "babel-loader": "8.4.1",
     "browserify-transform-tools": "1.7.0",
     "css-loader": "5.2.7",
     "cssnano": "5.1.15",