chore: fix cilium conformance report

[mlavacca]

What type of PR is this?

/kind documentation

What this PR does / why we need it:

#3137 added a new conformance report for Cilium. The report and the README were malformed in the following way:

• the link to the report in the README was broken
• the link to the cilium release was broken; Cilium v1.16.0 has not been released at the moment of writing yet, therefore I've set here the rc1 link.
• the version of the report was not set and instead was "main". Since the report was for Cilium version 1.16.0, I changed it to 1.16.0.

Once Cilium 1.16.0 gets released, we need to update this report again with the GH link to the new release.

Which issue(s) this PR fixes:

Fixes #

Does this PR introduce a user-facing change?:

NONE

[mlavacca]

@sayboras, please would you be able to update this README with the v1.16.0 release link once it gets released?

[sayboras]

Thanks

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mlavacca, sayboras

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• conformance/OWNERS [mlavacca]

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[sayboras]

please would you be able to update this README with the v1.16.0 release link once it gets released?

Noted and thanks for the ping.

[robscott]

Thanks @mlavacca!

/lgtm