Update CircleCI executor to node/node:20.18 and upgrade dependencies

Author: TomA-R

.circleci/config.yml

@@ -2,7 +2,7 @@ aliases:
   - &node_executor
       executor:
         name: node/node
-        node-version: "18.19"
+        node-version: "20.18"
 
 version: 2.1
 

jest-config.js

@@ -1,6 +1,6 @@
 module.exports = {
-    browser: true,
     preset: 'ts-jest',
+    testEnvironment: 'jsdom',
     moduleFileExtensions: [
         'ts',
         'tsx',