gnu: perl-net-dns: Update to 1.20.

* gnu/packages/networking.scm (perl-net-dns): Update to 1.20.

gnu/packages/networking.scm

@@ -948,7 +948,7 @@ (define-public perl-data-validate-ip
 (define-public perl-net-dns
  (package
   (name "perl-net-dns")
-  (version "1.19")
+  (version "1.20")
   (source
     (origin
       (method url-fetch)
@@ -959,7 +959,7 @@ (define-public perl-net-dns
         (string-append "mirror://cpan/authors/id/N/NL/NLNETLABS/Net-DNS-"
                        version ".tar.gz")))
       (sha256
-       (base32 "1myc23vz0m42yyg8iw7bf1pdrmx9ql6fhl2vwk1vwf55v6yphqi0"))))
+       (base32 "06z09igd42s0kg2ps5k7vpypg77zswfryqzbyalbllvjd0mnknbz"))))
   (build-system perl-build-system)
   (inputs
     `(("perl-digest-hmac" ,perl-digest-hmac)))