fix(deps): update module github.com/giantswarm/app/v7 to v8

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/giantswarm/app/v7	v7.1.0 -> v8.0.0

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Release Notes

giantswarm/app (github.com/giantswarm/app/v7)

v8.0.0

Compare Source

Changed

• Changed app.Validator interface.
  • Replaced projectName string field with isAdmissionController boolean field.
  • Removed enableManagedByLabel field.
• When app.Validator.isAdmissionController is enabled, the existence checks for referenced config maps and secrets
  under App CRs (.spec.config, .spec.userConfig, .spec.kubeConfig.secret) will be skipped. This makes the
  existence of the giantswarm.io/managed-by label irrelevant as that was used to produce this behaviour that is
  the default behaviour now.

Removed

• Removed key.IsManagedBy function as it is not relevant anymore.

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[renovate]

ℹ Artifact update notice

File name: go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 1 additional dependency was updated

Details:

Package	Change
sigs.k8s.io/controller-runtime	v0.19.6 -> v0.20.4

[marians]

Fails for the same reason as #1576