GH-39640: [Docs] Pin pydata-sphinx-theme to 0.14.*

[jorisvandenbossche]

Rationale for this change

Fixing the pinning syntax so we get the latest 0.14.x version (which is currently 0.14.4)

• Closes: [Docs] The message appearing when selecting dev version of the documentation is wrong #39640

[raulcd]

The docs are currently failing but I am not sure how this can be related:

 [autosummary] generating autosummary for: c_glib/index.rst, cpp/acero/developer_guide.rst, cpp/acero/overview.rst, cpp/acero/substrait.rst, cpp/acero/user_guide.rst, cpp/api.rst, cpp/api/acero.rst, cpp/api/array.rst, cpp/api/async.rst, cpp/api/builder.rst, ..., python/ipc.rst, python/json.rst, python/memory.rst, python/numpy.rst, python/orc.rst, python/pandas.rst, python/parquet.rst, python/timestamps.rst, r/index.rst, status.rst
WARNING: [autosummary] failed to import pyarrow.compute.ScalarUdfContext.
Possible hints:
* ModuleNotFoundError: No module named 'pyarrow.compute.ScalarUdfContext'; 'pyarrow.compute' is not a package
* AttributeError: module 'pyarrow.compute' has no attribute 'ScalarUdfContext'
* ImportError: 
[autosummary] generating autosummary for: /arrow/docs/source/python/generated/pyarrow.Array.rst, /arrow/docs/source/python/generated/pyarrow.BinaryArray.rst, /arrow/docs/source/python/generated/pyarrow.BinaryScalar.rst, /arrow/docs/source/python/generated/pyarrow.BooleanArray.rst, /arrow/docs/source/python/generated/pyarrow.BooleanScalar.rst, /arrow/docs/source/python/generated/pyarrow.Buffer.rst, /arrow/docs/source/python/generated/pyarrow.BufferOutputStream.rst, /arrow/docs/source/python/generated/pyarrow.BufferReader.rst, /arrow/docs/source/python/generated/pyarrow.ChunkedArray.rst, /arrow/docs/source/python/generated/pyarrow.Codec.rst, ..., /arrow/docs/source/python/generated/pyarrow.types.is_unicode.rst, /arrow/docs/source/python/generated/pyarrow.types.is_union.rst, /arrow/docs/source/python/generated/pyarrow.types.is_unsigned_integer.rst, /arrow/docs/source/python/generated/pyarrow.uint16.rst, /arrow/docs/source/python/generated/pyarrow.uint32.rst, /arrow/docs/source/python/generated/pyarrow.uint64.rst, /arrow/docs/source/python/generated/pyarrow.uint8.rst, /arrow/docs/source/python/generated/pyarrow.unify_schemas.rst, /arrow/docs/source/python/generated/pyarrow.unregister_extension_type.rst, /arrow/docs/source/python/generated/pyarrow.utf8.rst
loading intersphinx inventory from https://docs.python.org/3/objects.inv...
loading intersphinx inventory from https://numpy.org/doc/stable/objects.inv...
loading intersphinx inventory from https://pandas.pydata.org/docs/objects.inv...
WARNING: The version switcher "/docs/_static/versions.json" file cannot be read due to the following error:
building [mo]: targets for 0 po files that are out of date
writing output... 
FileNotFoundError(2, 'No such file or directory')

[jorisvandenbossche]

Hmm, not sure why we only see this error now, but this ScalarUdfContext has already been removed (renamed to UdfContext) for many months: #35514 (but that PR didn't update the docs)

[jorisvandenbossche]

This is green now, so going to merge this fix the CI.

[conbench-apache-arrow]

After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit c6ab286.

There were no benchmark performance regressions. 🎉

The full Conbench report has more details.