chore(deps): update helm release victoria-metrics-agent to v0.12.0

[p6r-renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
victoria-metrics-agent	HelmChart	minor	0.11.0 -> 0.12.0

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Release Notes

VictoriaMetrics/helm-charts (victoria-metrics-agent)

### [`v0.12.0`](https://redirect.github.com/VictoriaMetrics/helm-charts/releases/tag/victoria-metrics-agent-0.12.0) [Compare Source](https://redirect.github.com/VictoriaMetrics/helm-charts/compare/victoria-metrics-agent-0.11.0...victoria-metrics-agent-0.12.0) ### Release notes for version 0.12.0 **Release date:** 2024-08-29   - bump version of VM components to [v1.103.0](https://redirect.github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.103.0) - Added ability to configure container port - Fixed image pull secrets. See [this issue](https://redirect.github.com/VictoriaMetrics/helm-charts/issues/1285) - Removed necessity to set `.Values.persistentVolume.existingClaim` when volume is expected to be created by chart. See [this issue](https://redirect.github.com/VictoriaMetrics/helm-charts/issues/189)

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