Update tox.

Author: YooSunYoung

tox.ini

@@ -64,6 +64,8 @@ description = Update dependencies by running pip-compile-multi
 deps =
   pip-compile-multi
   tomli
+  # Avoid https://github.com/jazzband/pip-tools/issues/2131
+  pip==24.2
 skip_install = true
 changedir = requirements
 commands = python ./make_base.py --nightly scipp,sciline,scippnexus,plopp,essreduce,scippneutron,tof