CodeQL CLI update available

[github-actions]

A newer CodeQL CLI release is available upstream.

• Pinned (.codeqlversion): v2.26.3
• Latest upstream: v2.26.4

To start the update, run the "Update CodeQL CLI Version" workflow (workflow_dispatch) with codeql_version: 2.26.4. See CONTRIBUTING.md: Updating the pinned CodeQL CLI/library version for the full process.

This issue is kept up to date automatically by the "Detect New CodeQL CLI Release" workflow and will auto-close once .codeqlversion catches up.