Update dead link in releases.md

[Davo911]

What this PR does / why we need it:

Fix the dead link leading to the prow post periodic dashboard

Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes #

Special notes for your reviewer:

Release note:

NONE

[kubevirt-bot]

Hi @Davo911. Thanks for your PR.

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[akalenyu]

/lgtm
/approve
/test all

[kubevirt-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: akalenyu

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[Davo911]

won't work but
/retest

[awels]

/retest