community/black: upgrade to 21.4_beta2

community/black/APKBUILD

 # Contributor: Michał Polański <michal@polanski.me>
 # Maintainer: Michał Polański <michal@polanski.me>
 pkgname=black
-pkgver=21.4_beta1
+pkgver=21.4_beta2
 _pkgver=${pkgver/_beta/b}
 pkgrel=0
 pkgdesc="The uncompromising Python code formatter"
@@ -32,4 +32,4 @@ package() {
 	python3 setup.py install --root="$pkgdir" --skip-build
 }
 
-sha512sums="81cb107482c33317ec64cc04715ebd82e64b4f7e865271e9a134f51b6735979106f983eea3f57a9a4b808d6de3feb1e0fc6a1ad5290d5d06e8a63c6849c9d9fb  black-21.4b1.tar.gz"
+sha512sums="77866130c85a410cb11d9bcc4bd677e22086d4cfcbba59bc42f0569ecbe92b1e4278d6841e3731fe999d4fdf674dc6d2ec29f7bf2a60fb622fe5abc7f073a80a  black-21.4b2.tar.gz"