chore(deps): update dependency google.events.protobuf to v1.5.0

[renovate-bot]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
Google.Events.Protobuf	1.4.0 -> 1.5.0

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

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Release Notes

googleapis/google-cloudevents-dotnet (Google.Events.Protobuf)

### [`v1.5.0`](https://togithub.com/googleapis/google-cloudevents-dotnet/blob/HEAD/CHANGELOG.md#150-2024-04-04) ##### Features - Generate updated event definitions ([9d3b0c7](https://togithub.com/googleapis/google-cloudevents-dotnet/commit/9d3b0c7ed40fd3e1df711a264c04f65f57bacbc5))

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