utils: update toolchain snapshot to permit building early swift-driver

The early swift-driver on Windows requires statically linking to the
runtime. Update to a snapshot that is new enough to contain the static
runtime with the appropriate fixes to enable building the early
swift-driver.

Author: compnerd

utils/build.ps1

@@ -208,14 +208,14 @@ if ($Test -contains "*") {
 
 $DefaultPinned = @{
   AMD64 = @{
-    PinnedBuild = "https://download.swift.org/swift-6.1.2-release/windows10/swift-6.1.2-RELEASE/swift-6.1.2-RELEASE-windows10.exe";
-    PinnedSHA256 = "92A0323ED7DD333C3B05E6E0E428F3A91C77D159F6CCFC8626A996F2ACE09A0B";
-    PinnedVersion = "6.1.2";
+    PinnedBuild = "https://download.swift.org/development/windows10/swift-DEVELOPMENT-SNAPSHOT-2025-08-11-a/swift-DEVELOPMENT-SNAPSHOT-2025-08-11-a-windows10.exe"
+    PinnedSHA256 = "AD6B697EF4EBA1E4BE3808058227AFC01355FAD3A9BC9D8D139131B529E9394E";
+    PinnedVersion = "0.0.0";
   };
   ARM64 = @{
-    PinnedBuild = "https://download.swift.org/swift-6.1.2-release/windows10-arm64/swift-6.1.2-RELEASE/swift-6.1.2-RELEASE-windows10-arm64.exe";
-    PinnedSHA256 = "121FB407E578178F82DCCF39A4D03527873D8F7611A801A8FC26DA52503A0C5C";
-    PinnedVersion = "6.1.2";
+    PinnedBuild = "https://download.swift.org/development/windows10-arm64/swift-DEVELOPMENT-SNAPSHOT-2025-08-11-a/swift-DEVELOPMENT-SNAPSHOT-2025-08-11-a-windows10-arm64.exe";
+    PinnedSHA256 = "";
+    PinnedVersion = "0.0.0";
   };
 }