CI: Update deps to 2026-06-25 release

[RytoEX]

Description

CI: Update deps to 2026-06-25 release

Notable Changes:

• deps.ffmpeg: Update FFmpeg to 8.1.2

Motivation and Context

Address a reported security issue before FFmpeg 8.1.2.

How Has This Been Tested?

I haven't tested this yet.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• CI
• Dependencies

Checklist:

• I have read the contributing document.
• My code has been run through clang-format.
• My code follows the project's style guidelines
• My code is not on the master branch.
• My code has been tested.
• All commit messages are properly formatted and commits squashed where appropriate.
• I have included updates to all appropriate documentation.