gnu: r-dt: Update to 0.6.

* gnu/packages/statistics.scm (r-dt): Update to 0.6.

gnu/packages/statistics.scm

@@ -3161,13 +3161,13 @@ (define-public r-domc
 (define-public r-dt
   (package
     (name "r-dt")
-    (version "0.5")
+    (version "0.6")
     (source (origin
               (method url-fetch)
               (uri (cran-uri "DT" version))
               (sha256
                (base32
-                "1s5d3sld4l8zygpkvprvlbqa0pm2cv1bm7h7p999wxlap28vnnqf"))))
+                "05kr88yshq6siarp5q7aapvsr63vx3p0aqablwgifn8m2sfqxmif"))))
     (properties
      `((upstream-name . "DT")))
     (build-system r-build-system)