chore(ci): pin CI Node version to 18.17.1

[lilnasy]

Changes

• CI - Node 18.18 breaks playwright (not just playwright) on windows.

Testing

• Does not affect behavior.

Docs

• Does not affect usage.

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[matthewp]

In my PR: #8684 the Test CI one is failing too. Any reason not to do them both until this issue is resolved upstream?

[lilnasy]

It was neccessary for the "test" job as well, but that didn't fail the checks because branches in the withastro org use cache, and the "test" job was skipped.