fix(ErrorBoundary-types): change children type to ReactElement

`@testing-library/react` introduced new type definition for `wrapper`
in PR testing-library/react-testing-library#966,
then released it in `v12.1.1`.

issue testing-library/react-testing-library#970 5420890

Author: github-actions[bot]

.nojekyll

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+/* NProgress, (c) 2013, 2014 Rico Sta. Cruz - http://ricostacruz.com/nprogress
+ * @license MIT */

404.html

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+/*!
+  Copyright (c) 2018 Jed Watson.
+  Licensed under the MIT License (MIT), see
+  http://jedwatson.github.io/classnames
+*/
+
+/*!
+ * 
+ *   typed.js - A JavaScript Typing Animation Library
+ *   Author: Matt Boldt <[email protected]>
+ *   Version: v2.0.12
+ *   Url: https://github.com/mattboldt/typed.js
+ *   License(s): MIT
+ * 
+ */
+
+/** @license React v16.13.1
+ * react-is.production.min.js
+ *
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */

404.html.gz

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+{"polyfill":["/polyfill-fcad9c7a59939b7decf8.js"],"app":["/app-a6f960d3dfa4dfd72afb.js"],"component---cache-caches-gatsby-plugin-offline-app-shell-js":["/component---cache-caches-gatsby-plugin-offline-app-shell-js-627cce0d68b97dfbbaa0.js"],"component---src-pages-404-tsx":["/component---src-pages-404-tsx-c0733d6b2aeeaeaa2b22.js"],"component---src-templates-about-tsx":["/component---src-templates-about-tsx-634e7fa903888009e8be.js"],"component---src-templates-books-tsx":["/component---src-templates-books-tsx-aa6ed2a5cc4da7432521.js"],"component---src-templates-home-tsx":["/component---src-templates-home-tsx-237fa3e9a314d0f4b369.js"],"component---src-templates-post-tsx":["/component---src-templates-post-tsx-3ba933126d4b3073428f.js"],"component---src-templates-posts-tsx":["/component---src-templates-posts-tsx-71c55c774a79219dc246.js"],"component---src-templates-tags-tsx":["/component---src-templates-tags-tsx-6ebb16a96d505d1158f0.js"]}