Merge branch 'formulaire_cotisation' into 'master'

subscriptions: add date_of_birth for new users created in subscription form

See merge request !168
2 jobs for master in 7 minutes and 16 seconds (queued for 5 minutes and 41 seconds)
Status Job ID Name Coverage
  Test
passed #1723
black

00:00:57

passed #1722
test

00:06:18

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