main/py3-attrs: upgrade to 21.4.0

main/py3-attrs/APKBUILD

 # Contributor: Jean-Louis Fuchs <jean-louis.fuchs@adfinis-sygroup.ch>
 # Maintainer: Jean-Louis Fuchs <jean-louis.fuchs@adfinis-sygroup.ch>
 pkgname=py3-attrs
-pkgver=21.2.0
-pkgrel=1
+pkgver=21.4.0
+pkgrel=0
 pkgdesc="Python classes without boilerplate"
 url="http://www.attrs.org"
 arch="noarch"
@@ -29,6 +29,6 @@ package() {
 	python3 setup.py install --prefix=/usr --root="$pkgdir"
 }
 sha512sums="
-fa6569f3bdcc74a735b31dc67ce5ca3535eab8a5eb30f6b91ebf1149609294c0ef0d0910b8e41205d31c4745354c2262c18db901bae0af82c8b8cefc46f8a0a9  py-attrs-21.2.0.tar.gz
+aa45891f9beb00a2e03ae9326e0daa5789eb32164a1ee3a3fea618e2db30778d66bcce7f664134a99e1e45f7ee5040aa13ebc0d3d405acf57c580de6b35cfd76  py-attrs-21.4.0.tar.gz
 36bcb4ec145f29e79fc019dc39672f13dc94e1c07225968af51f19e17b2aede0b23dafdff265f1e77a251e53af9802bcf1db5068900ee0a03e1bfc1051c01ef9  check.py
 "