Fix zen & grav ci after Python-bindings became enabled by default (#1041)

Author: rolfmorel

benchmarks/harness/requirements.txt

@@ -1 +1,2 @@
 coloredlogs==15.0.1
+nanobind

tools/tpp-sched/tpp-sched.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 
 import sys
 from pathlib import Path