don't assume that handle uri remains valid after refreshLspSyncedDocument

Author: Techatrix

src/Server.zig

@@ -1165,7 +1165,7 @@ fn changeDocumentHandler(server: *Server, _: std.mem.Allocator, notification: ty
 
     if (server.client_capabilities.supports_publish_diagnostics) {
         try server.pushJob(.{
-            .generate_diagnostics = try server.allocator.dupe(u8, handle.uri),
+            .generate_diagnostics = try server.allocator.dupe(u8, notification.textDocument.uri),
         });
     }
 }