gnu: chrony: Update to 4.0.

* gnu/packages/ntp.scm (chrony): Update to 4.0.

gnu/packages/ntp.scm

@@ -43,14 +43,14 @@ (define-module (gnu packages ntp)
 (define-public chrony
   (package
     (name "chrony")
-    (version "3.5.1")
+    (version "4.0")
     (source
      (origin
        (method url-fetch)
        (uri (string-append "https://download.tuxfamily.org/chrony/"
                            "chrony-" version ".tar.gz"))
        (sha256
-        (base32 "19ywl8a3lb2id7lcna5hp2g4pjnfwdc9ihr0fk6i9m45vdq2za0v"))))
+        (base32 "09f6w2x5h5kamb4rhcbaz911q1f730qdalgsn8s48yjyqlafl9xy"))))
     (build-system gnu-build-system)
     (arguments
      `(#:modules ((srfi srfi-26)