gnu: r-testthat: Update to 2.1.1.

* gnu/packages/statistics.scm (r-testthat): Update to 2.1.1.

gnu/packages/statistics.scm

@@ -1586,13 +1586,13 @@ R packages that praise their users.")
 (define-public r-testthat
   (package
     (name "r-testthat")
-    (version "2.0.1")
+    (version "2.1.1")
     (source (origin
               (method url-fetch)
               (uri (cran-uri "testthat" version))
               (sha256
                (base32
-                "1cafy5xsjx6m08s45456mjsal7mfxzwpbrds0p4z3gwam948gpzy"))))
+                "03jgr0hlr77yp0aib4v30yjyjrjsa8dczr02yk21m93vl25vqvkp"))))
     (build-system r-build-system)
     (propagated-inputs
      `(("r-cli" ,r-cli)