chore(deps): Update bundler and rake for ruby 3.2+

Ruby <=3.1 is end-of-life so we can stop supporting it.

Reimplementation of [Update development dependencies to solve error by andyw8 · Pull Request #15 · joshbeckman/readwise-ruby](#15)

Author: joshbeckman

.github/workflows/ruby.yml

@@ -22,7 +22,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['2.6', '2.7', '3.0', '3.1', '3.2']
+        ruby-version: ['3.2', '3.3', '3.4']
 
     steps:
     - uses: actions/checkout@v3

readwise.gemspec

@@ -37,8 +37,8 @@ Gem::Specification.new do |spec|
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
-  spec.add_development_dependency "bundler", "~> 2.2"
-  spec.add_development_dependency "rake", "~> 10.0"
+  spec.add_development_dependency "bundler", "~> 2.4"
+  spec.add_development_dependency "rake", "~> 13.0"
   spec.add_development_dependency "rspec", "~> 3.0"
   spec.add_development_dependency "rspec-file_fixtures", "~> 0.1.6"
 end