fix(deps): Add PyPDF2 dependency for FEC export

Dépendances actuelles :
abc
apiclient
arrow
babel
barcodenumber
base64
bs4
calendar
click
codecs
collections
contextlib
copy
csv
datetime
dateutil
decimal
difflib
email
email_reply_parser
functools
googleapiclient
googlemaps
gzip
hashlib
hmac
holidays
inspect
io
itertools
jinja2
json
math
numpy
ofxtools
operator
os
pathlib
payments
plaid
pycountry
pypdf
PyPDF2
pypika
pytz
pyyoutube
random
rapidfuzz
re
requests
requests_oauthlib
rq
schwifty
sepaxml
statistics
string
sys
tenacity
time
traceback
typing
unidecode
unittest
urllib
uuid
warnings
zipfile

Manquantes:
taxjar
hypothesis (pour les tests, installé en CI)