Update ghcr.io/getporter/porter-operator-manager Docker tag to v0.7.4

This MR contains the following updates:

Package	Type	Update	Change
ghcr.io/getporter/porter-operator-manager	ironbank-docker	patch	v0.7.3 -> v0.7.4
ghcr.io/getporter/porter-operator-manager		patch	v0.7.3 -> v0.7.4
ghcr.io/getporter/porter-operator-manager	stage	patch	v0.7.3 -> v0.7.4

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