gnu: r-mbecs: Update to 1.6.0.

* gnu/packages/bioconductor.scm (r-mbecs): Update to 1.6.0.
[propagated-inputs]: Remove r-markdown.

Change-Id: I13cb50d3c4dba5eb9f923117b1537d77bce9cc16

gnu/packages/bioconductor.scm

@@ -11699,13 +11699,13 @@ (define-public r-ripseeker
 (define-public r-mbecs
   (package
     (name "r-mbecs")
-    (version "1.4.0")
+    (version "1.6.0")
     (source
      (origin
        (method url-fetch)
        (uri (bioconductor-uri "MBECS" version))
        (sha256
-        (base32 "0gfr3c5k7xjd342zfdksgh22mrk3ryr4cp89nar0mlpgzxg4l4vz"))))
+        (base32 "1j7vb26n2fnf5fkk8hfz552yx91g4zg719alhg4hg2vvjd1qx2l1"))))
     (properties `((upstream-name . "MBECS")))
     (build-system r-build-system)
     (arguments
@@ -11724,7 +11724,6 @@ (define-public r-mbecs
            r-lme4
            r-lmertest
            r-magrittr
-           r-markdown
            r-matrix
            r-pheatmap
            r-phyloseq