fix readme apply -f link for v0.4.0 release

[maelvls]

Changes

Apparently dashboard-latest-release.yaml was renamed dashboard_latest_release.yaml on v0.4.0, here is the fix 😁

Submitter Checklist

• Commit messages follow commit message best practices

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[tekton-robot]

Hi @maelvls. Thanks for your PR.

I'm waiting for a tektoncd member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[maelvls]

@googlebot I signed it!

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[a-roberts]

Yeah, my mistake 😅 we do have a readme checker that looks for valid links, looks like this wasn't picked up though so I got excited (and it was a Friday afternoon job 🏳️ )

/lgtm
/approve

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: a-roberts

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[a-roberts]

/test tekton-dashboard-unit-tests

#907 known flaky