CI: pin some builds to use pyarrow==1.0
Now that pyarrow 2.0 is released, it will get picked by the CI builds that don't pin the pyarrow version. It would be good to pin some builds to use pyarrow 1.0.

See this overview table of @simonjayhawkins at https://github.com/pandas-dev/pandas/pull/35259#issuecomment-712966527