Raise the execution timeout to 30 minutes for the CPU-only runners (#156)

numpy_vs_numba_vs_jax stopped fitting the 600s cell timeout on
ubuntu-latest: five consecutive cache builds timed out on it on
2026-08-18. cache.yml builds without -W so those runs stayed green
while leaving the notebook out of .jupyter_cache, which is what made
the publish-2026aug19 publish (-W) fail. The English repo keeps 600s
on its GPU runners.

Co-authored-by: Claude Fable 5 <noreply@anthropic.com>

Author: mmcky

lectures/_config.yml

@@ -5,7 +5,7 @@ description: This website presents a set of lectures on python programming for e
 
 execute:
   execute_notebooks: "cache"
-  timeout: 600 # 10 minutes
+  timeout: 1800 # 30 minutes: the numpy_vs_numba_vs_jax benchmarks run on CPU-only runners here and exceed 600s (the English repo builds on GPU)
 
 html:
   baseurl: https://quantecon.github.io/lecture-python-programming.fa/