Update dependency ghcr.io/fluxcd/source-controller to v0.26.1

This MR contains the following updates:

Package	Update	Change
ghcr.io/fluxcd/source-controller	minor	v0.25.11 -> v0.26.1

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Release Notes

fluxcd/source-controller

v0.26.1

Compare Source

v0.26.0

Compare Source

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