Update Terraform github.com/appuio/terraform-modules to v2.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
github.com/appuio/terraform-modules	module	minor	v2.6.0 -> v2.8.0

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Release Notes

appuio/terraform-modules

### [`v2.8.0`](https://togithub.com/appuio/terraform-modules/releases/tag/v2.8.0) [Compare Source](https://togithub.com/appuio/terraform-modules/compare/v2.7.0...v2.8.0) 1 changes since v2.7.0 #### 🛠️ Minor Changes - Make lb compute flavor configurable ([#​29](https://togithub.com/appuio/terraform-modules/issues/29)) ### [`v2.7.0`](https://togithub.com/appuio/terraform-modules/releases/tag/v2.7.0) [Compare Source](https://togithub.com/appuio/terraform-modules/compare/v2.6.0...v2.7.0) 1 changes since v2.6.0 #### 🛠️ Minor Changes - Switch LB servers to new cloudscale.ch flavor ([#​28](https://togithub.com/appuio/terraform-modules/issues/28))

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