chore(deps): update helm release backstage to v1.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Update	Change
backstage (source)	minor	1.7.0 -> 1.8.0

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Release Notes

backstage/charts (backstage)

### [`v1.8.0`](https://togithub.com/backstage/charts/releases/tag/backstage-1.8.0) [Compare Source](https://togithub.com/backstage/charts/compare/backstage-1.7.0...backstage-1.8.0) A Helm chart for deploying a Backstage application #### What's Changed - feat: allow for ingress.host templating by [@​tumido](https://togithub.com/tumido) in [https://github.com/backstage/charts/pull/153](https://togithub.com/backstage/charts/pull/153) **Full Changelog**: https://github.com/backstage/charts/compare/backstage-1.7.0...backstage-1.8.0

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[tumido]

/bump patch

[renovate[bot]]

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