refactor(tests): remove concurrency

This commit removes concurrency to hopefully improve the pass rate for
weval tests

Author: vados-cosmonic

test/bindings.js

@@ -17,7 +17,7 @@ suite('Bindings', async () => {
   const bindingsCases = await readdir(new URL('./cases', import.meta.url));
 
   for (const name of bindingsCases) {
-    test.concurrent(name, async () => {
+    test(name, async () => {
       const source = await readFile(
         new URL(`./cases/${name}/source.js`, import.meta.url),
         'utf8',

test/builtins.js

@@ -19,7 +19,7 @@ suite('Builtins', async () => {
 
   for (const filename of builtins) {
     const name = filename.slice(0, -3);
-    test.concurrent(name, async () => {
+    test(name, async () => {
       const {
         source,
         test: runTest,

test/vitest.ts

@@ -2,7 +2,7 @@ import { availableParallelism } from 'node:os';
 
 import { defineConfig } from 'vitest/config';
 
-const DEFAULT_TIMEOUT_MS = process.env.CI ? 240_000 : 120_000;
+const DEFAULT_TIMEOUT_MS = 120_000;
 
 const REPORTERS = process.env.GITHUB_ACTIONS
   ? ['verbose', 'github-actions']