Update Windows nightly toolchain - swift-DEVELOPMENT-SNAPSHOT-2024-04-21-a

Author: shahmishal

_data/builds/development/windows10.yml

@@ -1,3 +1,7 @@
+- date: 2024-04-21 10:10:00-06:00
+  dir: swift-DEVELOPMENT-SNAPSHOT-2024-04-21-a
+  download: swift-DEVELOPMENT-SNAPSHOT-2024-04-21-a-windows10.exe
+  name: Windows 10 Swift Development Snapshot
 - date: 2024-03-27 10:10:00-06:00
   dir: swift-DEVELOPMENT-SNAPSHOT-2024-03-27-a
   download: swift-DEVELOPMENT-SNAPSHOT-2024-03-27-a-windows10.exe