build: bump generate timeout to 10 hours (#2471)

Similar to #2445

Towards #2444

Signed-off-by: Anthonios Partheniou <[email protected]>

Author: parthea

infra/prod/generate.yaml

@@ -72,4 +72,4 @@ availableSecrets:
       env: 'LIBRARIAN_GITHUB_TOKEN'
 options:
   logging: CLOUD_LOGGING_ONLY
-timeout: 6h
+timeout: 10h