Update libpng to 1.6.54

[mattleibow]

Description of Change

Update libpng from 1.6.44 to 1.6.54

Bugs Fixed

• Fixes [BUG] Bump libpng in Skia deps to ≥ 1.6.51 (CVE-2025-64505, CVE-2025-64506 , CVE-2025-64720 , CVE-2025-65018) #3426

API Changes

None.

Behavioral Changes

None.

Required skia PR

mono/skia#162

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Merged related skia PRs
• Changes adhere to coding standard
• Updated documentation

[github-actions]

Triage Summary

No labels will be applied as the issue does not align with the available categories, specifically regarding the update of the libpng library.

This issue does not appear to be a regression since it simply discusses updating a library version without any implications of performance or compatibility issues.

Additional remarks:

• The issue pertains to updating the libpng library, which does not match any of the provided labels specific to documentation or bindings.
• No specific operating systems are mentioned, leading to the inability to assign relevant platform labels.
• The content does not indicate performance, reliability, or compatibility problems, which further restricts labeling options.
• There are no mentions of backend technologies that could warrant specific tags.

Detailed Summary and Actions

Summary of the triage:

• The issue focuses on updating the libpng library and does not fit within the existing labels for documentation, bindings, or platforms.
• It does not indicate any specific operating systems affected by the update, preventing any platform labels from being assigned.
• No performance degradation, crashes, or compatibility issues are mentioned, eliminating any implications of a regression.

Summary of the actions that will be performed:

Action	Item	Description
No Action	N/A	No relevant labels can be assigned to the issue regarding the update of libpng.

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