gnu: r-targets: Update to 1.7.0.

* gnu/packages/cran.scm (r-targets): Update to 1.7.0.
[propagated-inputs]: Remove r-digest.

Change-Id: I72c95351da2fe453014d25e4403a979dba9b35ec

gnu/packages/cran.scm

@@ -16787,13 +16787,13 @@ were influenced by the drake R package by Will Landau (2018)
 (define-public r-targets
   (package
     (name "r-targets")
-    (version "1.6.0")
+    (version "1.7.0")
     (source (origin
               (method url-fetch)
               (uri (cran-uri "targets" version))
               (sha256
                (base32
-                "1ddpbhvdydxm62k6ay7hpqjh8kh2isjpcdh3gygzcdrghx6d7x65"))))
+                "1h939mvyxd1wjakcbxjxcmn6a7i23ya1kc89aqwarizsj00hdjil"))))
     (properties `((upstream-name . "targets")))
     (build-system r-build-system)
     (propagated-inputs (list r-base64url
@@ -16801,7 +16801,6 @@ were influenced by the drake R package by Will Landau (2018)
                              r-cli
                              r-codetools
                              r-data-table
-                             r-digest
                              r-igraph
                              r-knitr
                              r-ps