bind: 9.16.13 -> 9.16.15

https://kb.isc.org/docs/cve-2021-25214

https://kb.isc.org/docs/cve-2021-25215

https://kb.isc.org/docs/cve-2021-25216

Fixes: CVE-2021-25214, CVE-2021-25215, CVE-2021-25216

pkgs/servers/dns/bind/default.nix

@@ -10,11 +10,11 @@ assert enablePython -> python3 != null;
 
 stdenv.mkDerivation rec {
   pname = "bind";
-  version = "9.16.13";
+  version = "9.16.15";
 
   src = fetchurl {
     url = "https://downloads.isc.org/isc/bind9/${version}/${pname}-${version}.tar.xz";
-    sha256 = "sha256-pUzHk/pbabNfYQ8glXYPgjjf9c/VJBn37hycIn2kzAg=";
+    sha256 = "0fbqisrh84f8wszm94cqp7v8q9r7pql3qyzbay7vz9vqv0rg9dlq";
   };
 
   outputs = [ "out" "lib" "dev" "man" "dnsutils" "host" ];