Update quay.io/metallb/controller Docker tag to v0.14.8

This MR contains the following updates:

Package	Type	Update	Change
quay.io/metallb/controller		patch	v0.14.7 -> v0.14.8
quay.io/metallb/controller	ironbank-docker	patch	v0.14.7 -> v0.14.8
quay.io/metallb/controller	stage	patch	v0.14.7 -> v0.14.8

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Release Notes

metallb/metallb (quay.io/metallb/controller)

v0.14.8: v0.14.18

Compare Source

See the release notes for the details

https://metallb.universe.tf/release-notes/#version-0-14-8

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