Fix vendor workflow failure when exporting empty GitHub env vars

[Copilot]

The Update Vendor workflow failed in Checking for updates when multiple dependencies were updated. The job attempted to export intentionally empty SINGLE_DEP_* values, but Set-GHVariable rejected empty-string input and terminated the run.

• What changed

  • Updated scripts/utils.ps1 to allow empty-string values in Set-GHVariable.
  • Kept existing call sites and workflow behavior unchanged; only the helper’s parameter binding was corrected.

• Why this resolves the failure

  • Multi-update paths legitimately set empty placeholders for single-dependency metadata.
  • Allowing empty-string input prevents a hard failure while preserving downstream conditional logic.

• Code change

function Set-GHVariable {
    param(
        [Parameter(Mandatory = $true)]
        [string]$Name,
        [Parameter(Mandatory = $true)]
        [AllowEmptyString()]
        [string]$Value
    )
    ...
}

[Copilot]

Pull request overview

This PR fixes the Update Vendor GitHub Actions workflow failing when it tries to export intentionally empty SINGLE_DEP_* environment variables by adjusting the PowerShell helper Set-GHVariable to accept empty-string values.

Changes:

• Added [AllowEmptyString()] to the mandatory Value parameter in Set-GHVariable so empty-string exports don’t fail parameter binding.

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