Merge pull request #56 from libgit2/cmn/gems

Update gems, let CI work with ruby 3

Author: carlosmn

docurium.gemspec

@@ -17,11 +17,11 @@ Gem::Specification.new do |s|
   s.add_dependency "mustache", "~> 1.1"
   s.add_dependency "rocco", "~>0.8"
   s.add_dependency "gli", "~>2.5"
-  s.add_dependency "rugged", "~>0.21"
+  s.add_dependency "rugged", "~>1.1"
   s.add_dependency "redcarpet", "~>3.0"
   s.add_dependency "ffi-clang", "~> 0.5"
-  s.add_dependency "parallel", "~> 1.17.0"
-  s.add_development_dependency "rake", "~> 12"
+  s.add_dependency "parallel", "~> 1.20"
+  s.add_development_dependency "rake", "~> 13"
   s.add_development_dependency "minitest", "~> 5.11"
 
   s.files         = `git ls-files`.split("\n")