Remove the indirect dependency on jinja2

[mwouts]

The build of the conda package for itables fails in version 1.6.0 and 1.6.1 because pandas.Style requires jinja2.

Cf. the build logs or this extract:

ModuleNotFoundError: No module named 'jinja2'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/conda/feedstock_root/build_artifacts/itables_1696129219663/test_tmp/run_test.py", line 2, in <module>
    import itables
  File "/home/conda/feedstock_root/build_artifacts/itables_1696129219663/_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/lib/python3.11/site-packages/itables/__init__.py", line 1, in <module>
    from .javascript import (
  File "/home/conda/feedstock_root/build_artifacts/itables_1696129219663/_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/lib/python3.11/site-packages/itables/javascript.py", line 13, in <module>
    import pandas.io.formats.style as pd_style
  File "/home/conda/feedstock_root/build_artifacts/itables_1696129219663/_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/lib/python3.11/site-packages/pandas/io/formats/style.py", line 44, in <module>
    jinja2 = import_optional_dependency("jinja2", extra="DataFrame.style requires jinja2.")
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/conda/feedstock_root/build_artifacts/itables_1696129219663/_test_env_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehold_placehol/lib/python3.11/site-packages/pandas/compat/_optional.py", line 135, in import_optional_dependency
    raise ImportError(msg)
ImportError: Missing optional dependency 'Jinja2'. DataFrame.style requires jinja2. Use pip or conda to install Jinja2.