As stated in the title, win-arm64 (Windows 11 ARM) has been added to the
workflows, so these builds should automatically compile for this PR and
all other releases going forward.

Also updated the FFmpeg runtimes from 5.0.3 to 6.1.2. macOS (x64/arm64)
is _currently_ excluded from the update until a proper cross-compiling
environment can be set up for these architectures.

Windows 11 ARM users, please test the win-arm64 build for any issues.

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Co-authored-by: Evan Husted <greem@greemdev.net>