fix(charts): update helm release keda to v2.15.1

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
keda	patch	2.15.0 -> 2.15.1

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Release Notes

kedacore/keda (keda)

### [`v2.15.1`](https://togithub.com/kedacore/keda/blob/HEAD/CHANGELOG.md#v2151) [Compare Source](https://togithub.com/kedacore/keda/compare/v2.15.0...v2.15.1) ##### Fixes - **General**: Hashicorp Vault PKI doesn't fail with due to KeyPair mismatch ([#​6028](https://togithub.com/kedacore/keda/issues/6028)) - **JetStream**: Consumer leader change is correctly detected ([#​6042](https://togithub.com/kedacore/keda/issues/6042)) ##### Other - **General**: Bump deps and k8s deps to 0.29.7 ([#​6035](https://togithub.com/kedacore/keda/pull/6035))

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