Fix worker versioning config API names in Ruby docs

The Configuring Workers for Versioning example used class/kwarg names
that don't exist in the SDK. Correct them to deployment_options:,
Temporalio::Worker::DeploymentOptions, and
Temporalio::WorkerDeploymentVersion, matching the actual API and the
Worker Configuration with Default Behavior example.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

references/ruby/versioning.md

@@ -198,8 +198,8 @@ worker = Temporalio::Worker.new(
   task_queue: 'my-task-queue',
   workflows: [MyWorkflow],
   activities: [MyActivity],
-  deployment_config: Temporalio::Worker::DeploymentConfig.new(
-    version: Temporalio::Worker::DeploymentVersion.new(
+  deployment_options: Temporalio::Worker::DeploymentOptions.new(
+    version: Temporalio::WorkerDeploymentVersion.new(
       deployment_name: 'my-service',
       build_id: 'v1.0.0' # or git commit hash
     ),