fix: fix cssselect pin

[samuelallan72]

Description

It was pinned in constraints, but this was not being honoured. I suspect it's because cssselect is not explicitly installed in the base requirements? Anyway, adding it here fixes it, successfully installing cssselect==1.2. Tested with python 3.11.

Supporting information

Private-ref: https://tasks.opencraft.com/browse/BB-10445

Testing instructions

• switch to the master branch, install in a virtual environment, and verify that the incorrect version of cssselect is installed (v1.3)
• switch to this branch, install in a virtual environment, and verify that cssselect==1.2 is successfully installed.

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[Agrendalath]

@samuelallan72, this is no longer needed, as we are removing this dependency in #228.