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	==2.19.2 -> ==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)) ### [`v2.20.0`](https://redirect.github.com/googleapis/python-api-core/blob/HEAD/CHANGELOG.md#2200-2024-09-18) [Compare Source](https://redirect.github.com/googleapis/python-api-core/compare/v2.19.2...v2.20.0) ##### Features - Add async unsupported paramater exception ([#​694](https://redirect.github.com/googleapis/python-api-core/issues/694)) ([8c137fe](https://redirect.github.com/googleapis/python-api-core/commit/8c137feb6e880fdd93d1248d9b6c10002dc3c096)) - Add support for asynchronous rest streaming ([#​686](https://redirect.github.com/googleapis/python-api-core/issues/686)) ([1b7bb6d](https://redirect.github.com/googleapis/python-api-core/commit/1b7bb6d1b721e4ee1561e8e4a347846d7fdd7c27)) - Add support for creating exceptions from an asynchronous response ([#​688](https://redirect.github.com/googleapis/python-api-core/issues/688)) ([1c4b0d0](https://redirect.github.com/googleapis/python-api-core/commit/1c4b0d079f2103a7b5562371a7bd1ada92528de3))

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