Update FFmpeg to fix 8-bit D3D11VA full range decoding

Author: cgutman

setup-deps.ps1

@@ -4,7 +4,7 @@ $Organization = "moonlight-stream"
 $PrebuiltRepo = "moonlight-qt-deps"
 $TargetDir = Join-Path $PSScriptRoot "libs\windows"
 $Assets = @("windows-x64.zip", "windows-ARM64.zip")
-$Tag = "v11"
+$Tag = "v12"
 
 if (Test-Path $TargetDir) {
     Write-Host "Cleaning target directory..." -ForegroundColor Cyan

setup-deps.py

@@ -7,7 +7,7 @@
 
 ORGANIZATION = "moonlight-stream"
 PREBUILT_REPO = "moonlight-qt-deps"
-TAG = "v11"
+TAG = "v12"
 
 def get_platform_config():
     system = platform.system()