asciidoctor-with-extensions: add 'text-hyphen' gem

Needed to control hyphenation in the PDF backend[1], or else:

  asciidoctor: WARNING: optional gem 'text-hyphen' is not available (reason: cannot load 'text/hyphen'). Functionality disabled.

[1] https://docs.asciidoctor.org/pdf-converter/latest/asciidoc-attributes/

pkgs/by-name/as/asciidoctor-with-extensions/Gemfile

@@ -11,4 +11,5 @@ gem 'asciidoctor-revealjs'
 gem 'coderay'
 gem 'pygments.rb'
 gem 'rouge'
+gem 'text-hyphen'
 gem 'tilt'

pkgs/by-name/as/asciidoctor-with-extensions/Gemfile.lock

@@ -128,6 +128,7 @@ GEM
       rb-fsevent (~> 0.9, >= 0.9.4)
       rb-inotify (~> 0.9, >= 0.9.7)
     stringio (3.1.8)
+    text-hyphen (1.5.0)
     thread_safe (0.3.6)
     tilt (2.6.1)
     time (0.4.1)
@@ -153,6 +154,7 @@ DEPENDENCIES
   coderay
   pygments.rb
   rouge
+  text-hyphen
   tilt
 
 BUNDLED WITH

pkgs/by-name/as/asciidoctor-with-extensions/gemset.nix

@@ -666,6 +666,16 @@
     };
     version = "3.1.8";
   };
+  text-hyphen = {
+    groups = [ "default" ];
+    platforms = [ ];
+    source = {
+      remotes = [ "https://rubygems.org" ];
+      sha256 = "01js0wxz84cc5hzxgqbcqnsa0y6crhdi6plmgkzyfm55p0rlajn4";
+      type = "gem";
+    };
+    version = "1.5.0";
+  };
   thread_safe = {
     groups = [ "default" ];
     platforms = [ ];