chore: Update generation configuration at Sat Oct 25 02:30:12 UTC 2025

Author: cloud-java-bot

generation_config.yaml

@@ -1,5 +1,5 @@
 gapic_generator_version: 2.63.0
-googleapis_commitish: 0830bd94ddc5a0dc7b8b6132d58f3997b40aac9f
+googleapis_commitish: b8a4d56335478100ceb9df549bd18119a4b4b392
 libraries_bom_version: 26.70.0
 libraries:
   - api_shortname: spanner