Add Ruby 3.4 to CI (#81)

Author: DmitryTsepelev

.github/workflows/rspec.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [3.1, 3.2, 3.3]
+        ruby: [3.1, 3.2, 3.3, 3.4]
         gemfile: [
           "gemfiles/graphql_2_1_0.gemfile",
           "gemfiles/graphql_2_2_5.gemfile",

graphql-persisted_queries.gemspec

@@ -23,6 +23,7 @@ Gem::Specification.new do |spec|
   spec.required_ruby_version = ">= 2.7"
 
   spec.add_dependency "graphql", ">= 2.0"
+  spec.add_dependency "base64"
 
   spec.add_development_dependency "rspec", "~> 3.9"
   spec.add_development_dependency "rake", ">= 10.0"