fix: sever env detection for deno

[elrrrrrrr]

In the new version of swr (2.3.0), globalThis is used to determine if the environment is Deno. (#2915)

This will cause errors in lower version browser environments (android <=13) (ios <12) where globalThis does not exist.

Since swr is a widely used request library, we hope to ensure compatibility as much as possible.

In Deno 2, window has been removed, as discussed in this issue: denoland/deno#13367

I have added a new method isLegacyDeno for this check. 🙏🏻

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