chore(deps): update dependency google-api-core to v2.19.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-api-core	==2.18.0 -> ==2.19.0

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Release Notes

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

### [`v2.19.0`](https://togithub.com/googleapis/python-api-core/blob/HEAD/CHANGELOG.md#2190-2024-04-29) [Compare Source](https://togithub.com/googleapis/python-api-core/compare/v2.18.0...v2.19.0) ##### Features - Add google.api_core.version_header ([#​638](https://togithub.com/googleapis/python-api-core/issues/638)) ([a7b53e9](https://togithub.com/googleapis/python-api-core/commit/a7b53e9e9a7deb88baf92a2827958429e3677069))

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