Update package version to 9.21.21

pkg.info

@@ -1,6 +1,6 @@
 name: bind
 description: A complete, highly portable implementation of the Domain Name System (DNS) protocol
-version: 9.21.19
+version: 9.21.21
 revision: 1
 url: https://www.isc.org/bind/
 license: MPL2
@@ -37,4 +37,4 @@ downloads:
   - url: https://ftp.isc.org/isc/bind9/${BPM_PKG_VERSION}/bind-${BPM_PKG_VERSION}.tar.xz
     extract_to: ${BPM_SOURCE}
     extract_strip_components: 1
-    checksum: dcc94c5f5baf1214fee11c578bf37edf314e7761d3bff5ed5f4b439d56dd56dc
+    checksum: 44ebfae8b82b494f5cc4781b044fbd4c867b64dc22ae9c62c9197aab16389112