Robert Schweizer 6a43a371f1
fix: Configure python urllib3 connection pool size (#17323)
This was removed in #16802, but using a higher value than 1,
or at least making this configurable makes complete sense.

Without this, we get a lot of these log messages:

[ WARNING] Connection pool is full, discarding connection:
2023-12-06 15:49:10 +08:00
..
2023-11-16 00:56:05 +08:00