ext/snmp: "No server response"

Unrelated to recent concurrency changes; always ran -j2. Separate daemon/ports could help. Retrying ok for now. Should be covered by shared concurrency tooling instead rolling own.

- https://github.com/php/php-src/pull/22476#issuecomment-5270688063
- https://github.com/php/php-src/pull/23237/changes#diff-d04552a469f6d782895191695156cf282c5577963770c9acf2479cbacc03672cR3127