(2026-R40) Version updates

Note: Your clusters might not have these versions available. Rollouts are already in progress when we publish the release notes, and can take multiple days to complete across all Google Cloud zones.

• Version 1.35.8-gke.1225000 is now the default version for cluster creation in the Extended channel.
• The following versions are now available in the Extended channel:
• 1.31.14-gke.2689000
• 1.31.14-gke.2759000
• 1.32.13-gke.2411000
• 1.32.13-gke.2504000
• 1.33.13-gke.1636000
• 1.33.13-gke.1721000
• 1.34.11-gke.1056000
• 1.35.8-gke.1380000
• 1.36.4-gke.1247000
• The following versions are no longer available in the Extended channel:
• 1.31.14-gke.2630000 is deprecated in the Extended channel. This version will be removed in 90 days, or at the end of support, if sooner.
• 1.31.14-gke.2704000 is