Bump E2E workflow Node.js to 22 (#1049)

The latest pnpm (11.1.3) requires Node.js v22.13+ and imports `node:sqlite`,
a built-in module that doesn't exist in Node 20. `actions/setup-node@v4`
crashes when setting up the pnpm cache, breaking the E2E job on every run
since #1044.

Bumping to Node 22 restores compatibility with the pnpm version pulled in by
`pnpm/action-setup@v4` (version: latest).

Author: donnchawp

.github/workflows/e2e-tests.yml

@@ -20,7 +20,7 @@ jobs:
 
       - uses: actions/setup-node@v4
         with:
-          node-version: '20'
+          node-version: '22'
           cache: pnpm
           cache-dependency-path: tests/e2e/pnpm-lock.yaml