PIP_CONSTRAINT deprecated for minimum_version #274
Description
in maintainer-tools/.github/actions/base-setup/setup_constraints.sh
running it with recent enough pip leads to
DEPRECATION: Setting PIP_CONSTRAINT will not affect build constraints in the future, pip 26.2 will enforce this behaviour change. A possible replacement is to specify build constraints using --build-constraint or PIP_BUILD_CONSTRAINT. To disable this warning without any build constraints set --use-feature=build-constraint or PIP_USE_FEATURE="build-constraint".