Accept signature for cosign

[ECiurleo]

Release step is failing with;

error=sign: cosign failed: exit status 1: WARNING: the -output-signature=dist/checksums.txt.sig flag is deprecated and will be removed in a future release. Please use the --output-signature=dist/checksums.txt.sig flag instead. Using payload from: dist/checksums.txt

This update uses the non-deprecated command and also accepts the sig.

This PR fixes #

Checklist

• [*] I have signed the CLA
• [*] I have updated/added any relevant documentation

Description

What's the goal of this PR?

To fix the failing circleci build

What changes did you make?

Added in a -y to accept the signature and updated the deprecated -output-signature

What alternative solution should we consider, if any?

Not looked at other options