net-mgmt/netdata: Fix build with python != 3.11

Reported by: Jordan Ostreff <jordan@ostreff.info> (via email)
Approved by: Namkhai B. <nk@nkeor.me> (maintainer, implicit - blanket)
MFH: 2026Q1

(cherry picked from commit 3aefd54fdc1b459e1a8262a440be60318aa78ac6)