gnu: Add rust-trust-dns-proto-0.20.

* gnu/packages/crates-io.scm (rust-trust-dns-proto-0.20): New variable.
(rust-trust-dns-proto-0.19): Inherit from above.

gnu/packages/crates-io.scm

@@ -44446,8 +44446,54 @@ (define-public rust-trust-dns-openssl-0.6
        (("rust-openssl" ,rust-openssl-0.10)
         ("rust-tokio" ,rust-tokio-0.1))))))
 
+(define-public rust-trust-dns-proto-0.20
+  (package
+    (name "rust-trust-dns-proto")
+    (version "0.20.0")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "trust-dns-proto" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "1gdsxjl628h02dp0fhcjz6js79fc4dxprqgqny6rghk450dki84q"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:skip-build? #t
+       #:cargo-inputs
+       (("rust-async-trait" ,rust-async-trait-0.1)
+        ("rust-backtrace" ,rust-backtrace-0.3)
+        ("rust-cfg-if" ,rust-cfg-if-1)
+        ("rust-data-encoding" ,rust-data-encoding-2)
+        ("rust-enum-as-inner" ,rust-enum-as-inner-0.3)
+        ("rust-futures-channel" ,rust-futures-channel-0.3)
+        ("rust-futures-io" ,rust-futures-io-0.3)
+        ("rust-futures-util" ,rust-futures-util-0.3)
+        ("rust-idna" ,rust-idna-0.2)
+        ("rust-ipnet" ,rust-ipnet-2)
+        ("rust-js-sys" ,rust-js-sys-0.3)
+        ("rust-lazy-static" ,rust-lazy-static-1)
+        ("rust-log" ,rust-log-0.4)
+        ("rust-openssl" ,rust-openssl-0.10)
+        ("rust-rand" ,rust-rand-0.8)
+        ("rust-ring" ,rust-ring-0.16)
+        ("rust-serde" ,rust-serde-1)
+        ("rust-smallvec" ,rust-smallvec-1)
+        ("rust-socket2" ,rust-socket2-0.3)
+        ("rust-thiserror" ,rust-thiserror-1)
+        ("rust-tokio" ,rust-tokio-1)
+        ("rust-url" ,rust-url-2)
+        ("rust-wasm-bindgen" ,rust-wasm-bindgen-0.2))))
+    (home-page "http://www.trust-dns.org/index.html")
+    (synopsis "Safe and secure DNS library")
+    (description
+     "Trust-DNS is a safe and secure DNS library.  This is the foundational
+DNS protocol library for all Trust-DNS projects.")
+    (license (list license:expat license:asl2.0))))
+
 (define-public rust-trust-dns-proto-0.19
   (package
+    (inherit rust-trust-dns-proto-0.20)
     (name "rust-trust-dns-proto")
     (version "0.19.5")
     (source
@@ -44458,7 +44504,6 @@ (define-public rust-trust-dns-proto-0.19
        (sha256
         (base32
          "0a4zlv60kkbg1nvy3zh18fdg681z83yzppzy39rdkm7llqdhdmyd"))))
-    (build-system cargo-build-system)
     (arguments
      `(#:cargo-inputs
        (("rust-async-trait" ,rust-async-trait-0.1)
@@ -44483,12 +44528,7 @@ (define-public rust-trust-dns-proto-0.19
        #:cargo-development-inputs
        (("rust-env-logger" ,rust-env-logger-0.7)
         ("rust-futures" ,rust-futures-0.3)
-        ("rust-tokio" ,rust-tokio-0.2))))
+        ("rust-tokio" ,rust-tokio-0.2))))))
-    (home-page "http://www.trust-dns.org/index.html")
-    (synopsis "Safe and secure DNS library")
-    (description "Trust-DNS is a safe and secure DNS library.  This is the
-foundational DNS protocol library for all Trust-DNS projects.")
-    (license (list license:expat license:asl2.0))))
 
 (define-public rust-trust-dns-proto-0.18
   (package