Update goharbor/registry-photon Docker tag to v2.8.1

This MR contains the following updates:

Package	Type	Update	Change
goharbor/registry-photon	ironbank-docker	patch	v2.8.0 -> v2.8.1
goharbor/registry-photon		patch	v2.8.0 -> v2.8.1
goharbor/registry-photon	stage	patch	v2.8.0 -> v2.8.1

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