try different ios tfm

Author: ericsink

version_stamp/Program.cs

@@ -112,7 +112,7 @@ private static void gen_directory_build_props(string root, string nupkgs_dir_nam
             f.WriteElementString("tfm_net", "net8.0");
             f.WriteElementString("tfm_framework", "net471");
             f.WriteElementString("tfm_windows", "net8.0-windows");
-            f.WriteElementString("tfm_ios", "net8.0-ios18.0");
+            f.WriteElementString("tfm_ios", "net9.0-ios18.2");
             f.WriteElementString("tfm_tvos", "net8.0-tvos18.0");
             f.WriteElementString("tfm_maccatalyst", "net8.0-maccatalyst18.0");