[FIX] core: PyPDF2 suppresses warnings

By default, PdfFileReader will monkeypatch the `warnings` module even
if it has no reason whatsoever to do so and suppress the
`captureWarnings` behavior.

This means as soon as we've loaded a PDF file, `warnings.warn` don't
trigger `logging` warnings anymore, and become invisible.

This can lead to non-deterministic behaviors depending as warnings may
or may not be suppressed depending when they occur relative to loading
a PDF e.g. load a module which runs a test which loads a PDF before a
module triggering a warning and the warning won't be visible, other
way around it will.

Except ofc while we have an override to PdfFileReader it's not
used *everywhere*, so need to monkeypatch the init.

closes odoo/odoo#60002

Signed-off-by: Xavier Morel (xmo) <xmo@odoo.com>

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