feat: Upgrade/react18

.eslintignore

@@ -1,5 +1,6 @@
 html.js
 **/lib
+**/doc
 packages/gatsby-theme-bodiless/dist
 packages/gatsby-theme-bodiless/cjs
 packages/gatsby-theme-bodiless/index.js

config/jestTestSetup.js

@@ -13,10 +13,16 @@
  */
 
 const enzyme = require('enzyme');
-const EnzymeAdapter = require('@wojtekmaj/enzyme-adapter-react-17');
+const EnzymeAdapter = require('@cfaester/enzyme-adapter-react-18').default;
 
 enzyme.configure({ adapter: new EnzymeAdapter() });
 
+const util = require('util');
+
+Object.defineProperty(global, 'TextEncoder', {
+  value: util.TextEncoder,
+});
+
 if (global.window && global.window.getSelection) {
   global.window.getSelection = () => ({
     removeAllRanges: () => {},