fix(charts): update helm release victoria-metrics-k8s-stack to v0.25.6

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
victoria-metrics-k8s-stack	patch	0.25.5 -> 0.25.6

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Release Notes

VictoriaMetrics/helm-charts (victoria-metrics-k8s-stack)

### [`v0.25.6`](https://togithub.com/VictoriaMetrics/helm-charts/releases/tag/victoria-metrics-k8s-stack-0.25.6) [Compare Source](https://togithub.com/VictoriaMetrics/helm-charts/compare/victoria-metrics-k8s-stack-0.25.5...victoria-metrics-k8s-stack-0.25.6) ### Release notes for version 0.25.6 **Release date:** 2024-08-29   **Update note**: Update `kubeProxy.spec` to `kubeProxy.vmScrape.spec` **Update note**: Update `kubeScheduler.spec` to `kubeScheduler.vmScrape.spec` **Update note**: Update `kubeEtcd.spec` to `kubeEtcd.vmScrape.spec` **Update note**: Update `coreDns.spec` to `coreDns.vmScrape.spec` **Update note**: Update `kubeDns.spec` to `kubeDns.vmScrape.spec` **Update note**: Update `kubeProxy.spec` to `kubeProxy.vmScrape.spec` **Update note**: Update `kubeControllerManager.spec` to `kubeControllerManager.vmScrape.spec` **Update note**: Update `kubeApiServer.spec` to `kubeApiServer.vmScrape.spec` **Update note**: Update `kubelet.spec` to `kubelet.vmScrape.spec` **Update note**: Update `kube-state-metrics.spec` to `kube-state-metrics.vmScrape.spec` **Update note**: Update `prometheus-node-exporter.spec` to `prometheus-node-exporter.vmScrape.spec` **Update note**: Update `grafana.spec` to `grafana.vmScrape.spec` - bump version of VM components to [v1.103.0](https://togithub.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.103.0) - Added `dashboards.` bool flag to enable dashboard even if component it is for is not installed. - Allow extra `vmalert.notifiers` without dropping default notifier if `alertmanager.enabled: true` - Do not drop default notifier, when vmalert.additionalNotifierConfigs is set - Replaced static url proto with a template, which selects proto depending on a present tls configuration - Moved kubernetes components monitoring config from `spec` config to `vmScrape.spec` - Merged servicemonitor templates

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