Add base64 as a dependency

Also add CI for Ruby 3.3

Author: Earlopain

.github/workflows/7.17.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ '3.0', '3.1', '3.2', 'jruby-9.3', 'jruby-9.4' ]
+        ruby: [ '3.0', '3.1', '3.2', '3.3', 'jruby-9.3', 'jruby-9.4' ]
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v2

elasticsearch-transport/elasticsearch-transport.gemspec

@@ -44,6 +44,7 @@ Gem::Specification.new do |s|
 
   s.required_ruby_version = '>= 2.4'
 
+  s.add_dependency 'base64'
   s.add_dependency 'multi_json'
   s.add_dependency 'faraday', '>= 1', '< 3'