fix(deps): update dependency @whatwg-node/fetch to v0.9.21

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@whatwg-node/fetch (source)	0.9.20 -> 0.9.21

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Release Notes

ardatan/whatwg-node (@​whatwg-node/fetch)

### [`v0.9.21`](https://togithub.com/ardatan/whatwg-node/blob/HEAD/packages/fetch/CHANGELOG.md#0921) [Compare Source](https://togithub.com/ardatan/whatwg-node/compare/@whatwg-node/fetch@0.9.20...@whatwg-node/fetch@0.9.21) ##### Patch Changes - [#​1577](https://togithub.com/ardatan/whatwg-node/pull/1577) [`99c4344`](https://togithub.com/ardatan/whatwg-node/commit/99c4344ec82717be079e725538a532a827fbef82) Thanks [@​ardatan](https://togithub.com/ardatan)! - - Improve native ReadableStream handling inside ponyfills - Use `waitUntil` instead of floating promises - Handle early termination in `WritableStream` - Handle `waitUntil` correctly within a dummy call of `ServerAdapter.fetch` method - Updated dependencies \[[`99c4344`](https://togithub.com/ardatan/whatwg-node/commit/99c4344ec82717be079e725538a532a827fbef82)]: - [@​whatwg-node/node-fetch](https://togithub.com/whatwg-node/node-fetch)[@​0](https://togithub.com/0).5.23

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