Update default.xml

Author: compnerd

default.xml

@@ -50,7 +50,7 @@
   <project remote="github" name="compnerd/swift-build" path="swift-build" />
   <project remote="github" name="compnerd/swift-win32" path="swift-win32" />
 
-  <project remote="github" name="curl/curl" path="curl" revision="refs/tags/curl-8_5_0" />
+  <project remote="github" name="curl/curl" path="curl" revision="refs/tags/curl-8_9_1" />
 
   <project remote="github" name="gnome/libxml2" path="libxml2" revision="refs/tags/v2.11.5" />