chore(deps): update helm release timescaledb-single to v0.21.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
timescaledb-single	minor	0.20.0 -> 0.21.0

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Release Notes

timescale/helm-charts

### [`v0.21.0`](https://togithub.com/timescale/helm-charts/releases/tag/timescaledb-single-0.21.0) [Compare Source](https://togithub.com/timescale/helm-charts/compare/timescaledb-single-0.20.0...timescaledb-single-0.21.0) #### What's Changed - Add missing k8s Service selector for timescaledb-single by [@​arajkumar](https://togithub.com/arajkumar) in [https://github.com/timescale/helm-charts/pull/485](https://togithub.com/timescale/helm-charts/pull/485) #### New Contributors - [@​arajkumar](https://togithub.com/arajkumar) made their first contribution in [https://github.com/timescale/helm-charts/pull/485](https://togithub.com/timescale/helm-charts/pull/485) **Full Changelog**: https://github.com/timescale/helm-charts/compare/avalanche-0.5.0...timescaledb-single-0.21.0

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