Pillow: update to 8.4.0

update 8.1.2 (2021-03-06) to 8.4.0 (2021-10-15)

Pillow is released quarterly on January 2nd, April 1st, July 1st and
October 15th. Patch releases are created if the latest release contains
severe bugs, or if security fixes are put together before a scheduled
release. See Versioning for more information.

Regular October 15th (2021) quarterly release - This is a Main Release.

release notes:
- https://pillow.readthedocs.io/en/latest/releasenotes/8.4.0.html
- https://github.com/python-pillow/Pillow/releases

packages/python/graphics/Pillow/package.mk

@@ -3,8 +3,8 @@
 # Copyright (C) 2019-present Team LibreELEC (https://libreelec.tv)
 
 PKG_NAME="Pillow"
-PKG_VERSION="8.1.2"
-PKG_SHA256="4b99c0a07e8bc4048b4f37ee515d02cc2f895453afe534e4b00bfe2f2a2dbe39"
+PKG_VERSION="8.4.0"
+PKG_SHA256="a726a4246cf1f26a5024b57c5d5fa0e98789262799860ed554ec028e2698f2c0"
 PKG_LICENSE="BSD"
 PKG_SITE="https://python-pillow.org/"
 PKG_URL="https://github.com/python-pillow/${PKG_NAME}/archive/${PKG_VERSION}.tar.gz"