Update ghcr.io/getporter/porter-operator-manager Docker tag to v0.8.0

This MR contains the following updates:

Package	Type	Update	Change
ghcr.io/getporter/porter-operator-manager	ironbank-docker	minor	v0.7.4 -> v0.8.0
ghcr.io/getporter/porter-operator-manager		minor	v0.7.4 -> v0.8.0
ghcr.io/getporter/porter-operator-manager	stage	minor	v0.7.4 -> v0.8.0

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