fix: include codegen snapshot in nx release changed files

The snapshot file was being updated by updateReactNativeArtifacts but
not included in the changedFiles list returned to nx, so it wasn't
staged in the release commit.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: Saadnajmi

packages/nx-release-version/index.js

@@ -64,6 +64,16 @@ async function runSetVersion() {
       'Core',
       'ReactNativeVersion.js',
     ),
+    path.join(
+      REPO_ROOT,
+      'packages',
+      'react-native',
+      'scripts',
+      'codegen',
+      '__tests__',
+      '__snapshots__',
+      'generate-artifacts-executor-test.js.snap',
+    ),
   ];
 }