gnu: ruby-asciidoctor-pdf: Update to 1.6.1.

* gnu/packages/ruby.scm (ruby-asciidoctor-pdf): Update to 1.6.1.
[arguments]: Remove trailing #t's.

gnu/packages/ruby.scm

@@ -1831,23 +1831,19 @@ (define-public ruby-open-uri-cached
     (license license:expat)))
 
 (define-public ruby-asciidoctor-pdf
-  ;; Use the latest commit, as the last tag doesn't build with the
-  ;; latest Ruby dependencies in Guix.
-  (let ((revision "1")
-        (commit "d257440df895d1595a3825ef58b32e4b290ba1c3"))
   (package
     (name "ruby-asciidoctor-pdf")
-      (version (git-version "1.5.3" revision commit))
+    (version "1.6.1")
     (source
      (origin
        (method git-fetch)               ;no test suite in the distributed gem
        (uri (git-reference
              (url "https://github.com/asciidoctor/asciidoctor-pdf")
-               (commit commit)))
+             (commit (string-append "v" version))))
        (file-name (git-file-name name version))
        (sha256
         (base32
-           "1563d11ghzsrsg4inwfwj6b9hb5sk5b429f49fwq5qg3sq76kgjj"))))
+         "1iyfy6n9d3rkyrfjmnnfb44c76mq1larmkv1x8n6p5nbm33wb9sf"))))
     (build-system ruby-build-system)
     (arguments
      `(#:test-target "spec"
@@ -1859,14 +1855,12 @@ (define-public ruby-asciidoctor-pdf
            ;; https://github.com/asciidoctor/asciidoctor-pdf/issues/1725#issuecomment-658777965).
            (lambda _
              (delete-file "spec/audio_spec.rb")
-               (delete-file "spec/video_spec.rb")
-               #t))
+             (delete-file "spec/video_spec.rb")))
          (add-after 'extract-gemspec 'strip-version-requirements
            (lambda _
              (substitute* "asciidoctor-pdf.gemspec"
                (("(.*add_.*dependency '[_A-Za-z0-9-]+').*" _ stripped)
-                  (string-append stripped "\n")))
-               #t))
+                (string-append stripped "\n")))))
          ;; The tests rely on the Gem being installed, so move the check phase
          ;; after the install phase.
          (delete 'check)
@@ -1877,8 +1871,7 @@ (define-public ruby-asciidoctor-pdf
                (setenv "GEM_PATH"
                        (string-append (getenv "GEM_PATH") ":" new-gem))
                (when tests?
-                   (invoke "rspec" "-t" "~visual" "-t" "~cli" "-t" "~network"))
-                 #t))))))
+                 (invoke "rspec" "-t" "~visual" "-t" "~cli" "-t" "~network"))))))))
     (native-inputs
      `(("ruby-chunky-png" ,ruby-chunky-png)
        ("ruby-coderay" ,ruby-coderay)
@@ -1924,7 +1917,7 @@ (define-public ruby-asciidoctor-pdf
 @item Double-sided printing mode (margins alternate on recto and verso pages)
 @end itemize")
     (home-page "https://asciidoctor.org/docs/asciidoctor-pdf")
-      (license license:expat))))
+    (license license:expat)))
 
 (define-public ruby-ast
   (package