gnu: r-annotationhub: Update to 2.20.0.

* gnu/packages/bioinformatics.scm (r-annotationhub): Update to 2.20.0.
[native-inputs]: Add r-knitr.

gnu/packages/bioinformatics.scm

@@ -10046,14 +10046,14 @@ Shiny-based display methods for Bioconductor objects.")
 (define-public r-annotationhub
   (package
     (name "r-annotationhub")
-    (version "2.18.0")
+    (version "2.20.0")
     (source
      (origin
        (method url-fetch)
        (uri (bioconductor-uri "AnnotationHub" version))
        (sha256
         (base32
-         "19vj3bk8jz68q84g3j8xs1s9bqz90lbwbciig1h45zvn2zc6087m"))))
+         "0r4xzf93bm9cpys5cg70wg0b8hxli80hvqwgh4hzbd45yyf5c4wz"))))
     (properties `((upstream-name . "AnnotationHub")))
     (build-system r-build-system)
     (propagated-inputs
@@ -10070,6 +10070,8 @@ Shiny-based display methods for Bioconductor objects.")
        ("r-rsqlite" ,r-rsqlite)
        ("r-s4vectors" ,r-s4vectors)
        ("r-yaml" ,r-yaml)))
+    (native-inputs
+     `(("r-knitr" ,r-knitr)))
     (home-page "https://bioconductor.org/packages/AnnotationHub")
     (synopsis "Client to access AnnotationHub resources")
     (description