unpin vite and use ^2.3.1 to skip 2.3.0

[dominikg]

Before submitting the PR, please make sure you do the following

• It's really useful if your PR references an issue where it is discussed ahead of time. In many cases, features are absent for a reason. For large changes, please create an RFC: https://github.com/sveltejs/rfcs
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vite 2.3.1 disables the problematic fs check by default