release version 9.0

Problem:    About time to release Vim 9.0.
Solution:   Update the version number everywhere.
diff --git a/src/vim.manifest b/src/vim.manifest
index 9ca50ec..ff30fbc 100644
--- a/src/vim.manifest
+++ b/src/vim.manifest
@@ -8,7 +8,7 @@
 <assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0" xmlns:asmv3="urn:schemas-microsoft-com:asm.v3">
   <assemblyIdentity
     processorArchitecture="*"
-    version="8.2.0.0"
+    version="9.0.0.0"
     type="win32"
     name="Vim"
   />