Update external-dns to v0.20.0 (minor)

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
kubernetes-sigs/external-dns	Kustomization	minor	v0.19.0 -> v0.20.0
registry.k8s.io/external-dns/external-dns	Kustomization	minor	v0.19.0 -> v0.20.0

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Release Notes

kubernetes-sigs/external-dns (kubernetes-sigs/external-dns)

v0.20.0

Compare Source

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