chore(deps): update registry.redhat.io/ubi9/go-toolset docker tag to v9

[red-hat-konflux]

This PR contains the following updates:

Package	Type	Update	Change
registry.redhat.io/ubi9/go-toolset	stage	major	1.24 -> 9.6

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Summary by Sourcery

Chores:

• Bump registry.redhat.io/ubi9/go-toolset image tag from 1.24 to 9.6

[sourcery-ai]

Reviewer's Guide

This PR bumps the UBI9 Go toolset base image from version 1.24 to 9.6 in the Cosign Dockerfile, ensuring builds use the updated tooling image.

File-Level Changes

Change	Details	Files
Bump go-toolset base image to v9.6	Updated FROM registry.redhat.io/ubi9/go-toolset tag from 1.24 to 9.6	Dockerfile.cosign.rh

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