Fix constraint generation on CI (#23194)
Fix constraint generation on CI (#23194)

This is another small aftermath after the #23104 - this could not
be tested during PRs because generate-constraints only run in
main in apache/airflow repo and a problem crept in that I have
forgotten to add --run-in-parallel for those breeze commands,
which resulted in missing the python version to generate
constraints for.

This change adds --run-in-parallell and list of python versions
to work on so that generate constraints might start work again.
danielvdende/incubator-airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,cfei18/incubator-airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,Acehaidrey/incubator-airflow,nathanielvarona/airflow,lyft/incubator-airflow,apache/airflow,apache/airflow,apache/airflow,nathanielvarona/airflow,apache/airflow,nathanielvarona/airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,nathanielvarona/airflow,apache/airflow,lyft/incubator-airflow,danielvdende/incubator-airflow,apache/airflow,lyft/incubator-airflow,Acehaidrey/incubator-airflow,danielvdende/incubator-airflow,nathanielvarona/airflow,nathanielvarona/airflow,danielvdende/incubator-airflow,cfei18/incubator-airflow,lyft/incubator-airflow,cfei18/incubator-airflow,danielvdende/incubator-airflow