gnu: certbot: Update to 0.21.0.

* gnu/packages/tls.scm (certbot): Update to 0.21.0.
(python-acme): Update to 0.21.0.
[propagated-inputs]: Add python-josepy.

gnu/packages/tls.scm

@@ -530,13 +530,13 @@ netcat implementation that supports TLS.")
   (package
     (name "python-acme")
     ;; Remember to update the hash of certbot when updating python-acme.
-    (version "0.20.0")
+    (version "0.21.0")
     (source (origin
               (method url-fetch)
               (uri (pypi-uri "acme" version))
               (sha256
                (base32
-                "1md3llp6640dviv9bzyy7qzn3szxil38645cjqcg7hlcdknil4j5"))))
+                "0kalcz8xc0z8azh3v3a8h27clwy4wh5lx6w8zac1rchbghkawknn"))))
     (build-system python-build-system)
     (arguments
      `(#:phases
@@ -561,7 +561,8 @@ netcat implementation that supports TLS.")
        ("python-sphinx-rtd-theme" ,python-sphinx-rtd-theme)
        ("texinfo" ,texinfo)))
     (propagated-inputs
-     `(("python-six" ,python-six)
+     `(("python-josepy" ,python-josepy)
+       ("python-six" ,python-six)
        ("python-requests" ,python-requests)
        ("python-pytz" ,python-pytz)
        ("python-pyrfc3339" ,python-pyrfc3339)
@@ -584,7 +585,7 @@ netcat implementation that supports TLS.")
               (uri (pypi-uri name version))
               (sha256
                (base32
-                "126y6jg1nyd8js2jchl4dbmpg507hawaxnyw7510qh7vcidm1gya"))))
+                "0msqm3ils193m56h4c9866rg8ib50g0wag0i30sffbs6sd335jh7"))))
     (build-system python-build-system)
     (arguments
      `(,@(substitute-keyword-arguments (package-arguments python-acme)