Update ci-toolkit and docker plugin

Author: AliSoftware

.buildkite/pipeline.yml

@@ -35,7 +35,7 @@ steps:
         matrix:
           setup:
             ruby:
-              - 3.2.2
+              - "$RUBY_VERSION"
 
   #################
   # Push to RubyGems

.buildkite/shared-pipeline-vars

@@ -1,7 +1,7 @@
 #!/bin/bash
 
 export IMAGE_ID="xcode-26.1.1"
-export CI_TOOLKIT="automattic/a8c-ci-toolkit#3.7.1"
-export DOCKER_PLUGIN="docker#v5.8.0"
+export CI_TOOLKIT="automattic/a8c-ci-toolkit#5.7.0"
+export DOCKER_PLUGIN="docker#v5.13.0"
 export RUBY_VERSION="3.2.2"
 export DOCKER_RUBY_IMAGE="public.ecr.aws/docker/library/ruby:$RUBY_VERSION"