testing/py3-dt-schema: upgrade to 2020.12

testing/py3-dt-schema/APKBUILD

 # Contributor: Iskren Chernev <iskren.chernev@gmail.com>
 # Maintainer: Iskren Chernev <iskren.chernev@gmail.com>
 pkgname=py3-dt-schema
-pkgver=2020.05
+pkgver=2020.12
 pkgrel=0
 pkgdesc="Devicetree schema tools"
 url="https://github.com/devicetree-org/dt-schema"
@@ -21,4 +21,4 @@ build() {
 package() {
 	SETUPTOOLS_SCM_PRETEND_VERSION="$pkgver" python3 setup.py install --prefix=/usr --root="$pkgdir"
 }
-sha512sums="85b2a614e5424da4b20002935c0973f66febc12dd96c1497d548cb7fca67a5f2a1b48d5ef297e0dab33a95682aa08626a8304f5ea6f18b875d689f7f964ae089  dt-schema-2020.05.tar.gz"
+sha512sums="45c32de66a208cdfff8ea9ca8601a01dbeebb4e0509d55c124da837ef99c7a7c911514b71dbbdca061b7e8e9012557648c7b32b156637be23e53e8ae4e671b35  dt-schema-2020.12.tar.gz"