[FIX] requirements: avoid double requirements for pillow
[FIX] requirements: avoid double requirements for pillow

When installing requirements on MS Windows platform with Python 3.8, the
Pillow requirement is defined two times. This leads to a pip crash.

With this commit, the Pillow requirement is only defined once.

Fixes #40080

closes odoo/odoo#40272

X-original-commit: cce9660c2969cc2715ff29b6dfa12e1b726bce25
Signed-off-by: Christophe Monniez (moc) <c96e125261f5e7e830d26ea98a02884db1f08bc3@odoo.com>

ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo,ygol/odoo