…e with pyarrow (#2338)

Due to an issue with `pyarrow`, a significant dependency for certain
python-bigquery use cases, not being compatible with Python 3.14, we
temporarily skipped the failing CI/CD check for 3.14 while awaiting the
update to pyarrow. Pyarrow is now fully compatible, so that filter is
being removed.

**KNOWN ISSUES**: this will show that unittests for 3.14 are failing.
This has nothing to do with this PR/these changes. It is being addressed
in an alternate mod. It is due to a missing dependency related to
handling IO for `geopandas` (namely it is missing `libgdal-dev`, etc
which are normally installed with `pyogrio` + `geopandas`). Because
`pyogrio` is currently not compatible with Python 3.14 the tests in 3.14
cannot complete.

This should not prevent **this PR from being merged** to help solve the
current issue, which is a blocker for getting our continuous tests to
green.