Use Node 22 for GitHub actions for now (#6575)

## What's the problem this PR addresses?

There are a number of issues affecting Node 23, causing our E2E suite
and performance benchmarks to fail since its release:

nodejs/node#54224 (comment)
evanw/esbuild#3951

## How did you fix it?

Drop down to Node 22 for those actions until the issues are cleared

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.github/actions/prepare/action.yml

@@ -6,7 +6,7 @@ inputs:
   node-version:
     description: 'The version of Node.js to use'
     required: false
-    default: 'current'
+    default: '22'
 
 runs:
   using: composite