chore(deps): update dependency google-api-core to v2.21.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-api-core	==2.20.0 -> ==2.21.0

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Release Notes

googleapis/python-api-core (google-api-core)

### [`v2.21.0`](https://redirect.github.com/googleapis/python-api-core/blob/HEAD/CHANGELOG.md#2210-2024-10-07) [Compare Source](https://redirect.github.com/googleapis/python-api-core/compare/v2.20.0...v2.21.0) ##### Features - Add support for asynchronous long running operations ([#​724](https://redirect.github.com/googleapis/python-api-core/issues/724)) ([aaed69b](https://redirect.github.com/googleapis/python-api-core/commit/aaed69b6f1d694cd7e561e2aa03fdd8d6cfb369a)) ##### Bug Fixes - Set chunk size for async stream content ([#​702](https://redirect.github.com/googleapis/python-api-core/issues/702)) ([45b8a6d](https://redirect.github.com/googleapis/python-api-core/commit/45b8a6db5a5c75acdd8be896d0152f11608c7e51))

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