Update ghcr.io/fluxcd/source-controller Docker tag to v0.7.1

This MR contains the following updates:

Package	Type	Update	Change
ghcr.io/fluxcd/source-controller	ironbank-docker	minor	v0.5.6 -> v0.7.1
ghcr.io/fluxcd/source-controller		minor	v0.5.6 -> v0.7.1
ghcr.io/fluxcd/source-controller	stage	minor	v0.5.6 -> v0.7.1

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