CI: Fix error when creating postgresql db (pandas-dev#29655)

Author: datapythonista

ci/setup_env.sh

@@ -114,6 +114,11 @@ echo "w/o removing anything else"
 conda remove pandas -y --force || true
 pip uninstall -y pandas || true
 
+echo
+echo "remove postgres if has been installed with conda"
+echo "we use the one from the CI"
+conda remove postgresql -y --force || true
+
 echo
 echo "conda list pandas"
 conda list pandas