Update ava.config.js for Node v20

Author: razor-x

ava.config.js

@@ -2,13 +2,9 @@ export default () => {
   return {
     ignoredByWatcher: ['tmp/**/*'],
     files: ['**/*.test.ts', '!package/**/*'],
-    environmentVariables: {
-      // UPSTREAM: https://nodejs.org/docs/latest-v18.x/api/esm.html#loaders
-      NODE_NO_WARNINGS: '1',
-    },
     extensions: {
-      ts: 'module',
+      ts: 'commonjs'
     },
-    nodeArguments: ['--loader=tsx'],
+    nodeArguments: ['--import=tsx']
   }
 }