Bump external-dns image tag to v0.13.1

[zioproto]

I tested the tutorial with:

image: k8s.gcr.io/external-dns/external-dns:v0.13.1

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[johngmyers]

/lgtm

[seanmalloy]

/approve
/kind documentation

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[johngmyers]

/retest

[johngmyers]

It's a GitHub Action that failed. I think you might need to rebase in order to pick up the fix to the test.

[johngmyers]

/lgtm