chore(aws-cdk-lib): fix error message using deprecated 'name' property (#28275)

Instead of throwing the descriptive error, we throw:

```
ReferenceError: name is not defined
```

We meant to use `submodule.name`, not `name`.

----

*By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license*

Author: kaizencc

packages/aws-cdk-lib/scripts/submodules/index.ts

@@ -55,7 +55,7 @@ async function ensureSubmodule(submodule: ModuleMapEntry, modulePath: string) {
   if (!fs.existsSync(path.join(modulePath, '.jsiirc.json'))) {
     if (!submodule.definition) {
       throw new Error(
-        `Cannot infer path or namespace for submodule named "${name}". Manually create ${modulePath}/.jsiirc.json file.`,
+        `Cannot infer path or namespace for submodule named "${submodule.name}". Manually create ${modulePath}/.jsiirc.json file.`,
       );
     }
 
@@ -74,4 +74,4 @@ async function ensureSubmodule(submodule: ModuleMapEntry, modulePath: string) {
     };
     await fs.writeJson(path.join(modulePath, '.jsiirc.json'), jsiirc, { spaces: 2 });
   }
-}
+}