Fix yq expression

[jkremser]

No description provided.

[Copilot]

Pull Request Overview

This PR fixes a yq expression in the GitHub workflow for releasing charts. The changes consolidate multiple yq operations into a single command and switch from GitHub Actions environment variable syntax to shell variable syntax.

• Simplified yq command execution by combining version and createdAt updates into a single expression
• Replaced GitHub Actions environment variable syntax (${{ env.current_tag }}) with shell variable syntax (${current_tag#v})
• Added shell variable assignment for the version value with the 'v' prefix stripped

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