deps: update dependency com.google.cloud:google-cloud-datastore-bom to v2.21.2

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
com.google.cloud:google-cloud-datastore-bom	2.21.1 -> 2.21.2

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[!WARNING] Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

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Release Notes

googleapis/java-datastore (com.google.cloud:google-cloud-datastore-bom)

### [`v2.21.2`](https://togithub.com/googleapis/java-datastore/blob/HEAD/CHANGELOG.md#2212-2024-08-22) [Compare Source](https://togithub.com/googleapis/java-datastore/compare/v2.21.1...v2.21.2) ##### Dependencies - Update dependency com.google.cloud:sdk-platform-java-config to v3.34.0 ([#​1547](https://togithub.com/googleapis/java-datastore/issues/1547)) ([8c5f595](https://togithub.com/googleapis/java-datastore/commit/8c5f5954d88732ab929b4477a3f15b0052adc2ff))

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[suztomo]

Added Kokoro label to experiment a new check cl/667601630. (No need to wait for the check to show success.)

[mpeddada1]

Added Kokoro label to experiment a new check cl/667601630. (No need to wait for the check to show success.)

Ah thanks for the heads up!