fixup! utils: update toolchain snapshot to permit use of the experimental SDK

Author: compnerd

utils/build.ps1

@@ -276,7 +276,7 @@ if ($UseHostToolchain -is [string]) {
 $DefaultPinned = @{
   AMD64 = @{
     PinnedBuild = "https://download.swift.org/development/windows10/swift-DEVELOPMENT-SNAPSHOT-2025-11-03-a/swift-DEVELOPMENT-SNAPSHOT-2025-11-03-a-windows10.exe";
-    PinnedSHA256 = "";
+    PinnedSHA256 = "1B93C9B419070925E5ABCD1A273C510121E9928554876EC0DCA530121D8C93D3";
     PinnedVersion = "0.0.0";
   };
   ARM64 = @{