Update fluxcd/image-reflector-controller Docker tag to v0.15.0

This MR contains the following updates:

Package	Type	Update	Change
fluxcd/image-reflector-controller	ironbank-docker	minor	v0.14.0 -> v0.15.0
fluxcd/image-reflector-controller		minor	v0.14.0 -> v0.15.0
fluxcd/image-reflector-controller	stage	minor	v0.14.0 -> v0.15.0

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Release Notes

fluxcd/image-reflector-controller

v0.15.0

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CHANGELOG

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