[whatwg/fetch] Mark `AbortSignal` as nullable (PR #1856)

The getter steps [1] specify to return `this.signal`. Its signal is nullable [2] and therefore the getter should also be nullable.

[1]: https://fetch.spec.whatwg.org/#dom-request-signal
[2]: https://fetch.spec.whatwg.org/#request-signal


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  https://github.com/whatwg/fetch/pull/1856

-- Commit Summary --

  * Mark `AbortSignal` as nullable

-- File Changes --

    M fetch.bs (2)

-- Patch Links --

https://github.com/whatwg/fetch/pull/1856.patch
https://github.com/whatwg/fetch/pull/1856.diff

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