chore: fix the release please reference to version.py

I made a mistake in previous change and didn't include the full path.

PiperOrigin-RevId: 713017199

Author: amirh

.github/release-please.yml

@@ -2,4 +2,4 @@ releaseType: python
 handleGHRelease: true
 bumpMinorPreMajor: true
 extraFiles:
-  - version.py
+  - google/genai/version.py