build: ensure non-gil wheels are not made for free threaded

Author: henryborchers

Jenkinsfile

@@ -1201,7 +1201,7 @@ pipeline {
                                                                             ]){
                                                                                 timeout(60){
                                                                                     sh(label: 'Running Tox',
-                                                                                       script: """python${pythonVersion} -m venv venv
+                                                                                       script: """python3 -m venv venv
                                                                                                   trap "rm -rf venv" EXIT
                                                                                                   ./venv/bin/python -m pip install --disable-pip-version-check uv
                                                                                                   trap "rm -rf venv && rm -rf .tox" EXIT