Update VERSION_WIN_SDK (#26797)

Make sure we get latest build tools/platform for Windows.  It wasn't previously failing, but now is.  Similar changes made to Linux/Mac recently.
diff --git a/dev/bots/VERSION_WIN_SDK b/dev/bots/VERSION_WIN_SDK
index 85d8ec3..62f82dd 100644
--- a/dev/bots/VERSION_WIN_SDK
+++ b/dev/bots/VERSION_WIN_SDK
@@ -1 +1 @@
-34304f0ab51bedb180cbf5795203c9d750b10849
+6a0a0b852dc974b8aed40dad44f0feb4e128e737