V13: bumped imagesharp to prevent CVE-2025-27598

[RolandKock]

Prerequisites

• I have added steps to test this contribution in the description below

If there's an existing issue for this PR then this fixes

Description

Updated dependencies for SixLabors.ImageSharp:
[email protected] -> 3.1.7
[email protected] -> 2.1.10

GHSA-2cmq-823j-5qj8

[github-actions]

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[RolandKock]

@AndyButland Seems more like it

[RolandKock]

Solves #18599

[AndyButland]

Thanks @RolandKock - I'll merge this in and up to 15 to include in upcoming releases.