[Ruby Tutorial] Bump ruby alpine docker image version to 3.3.6-alpine…

…3.20 (jenkins-infra#7663)

chore: Update the value of the ruby docker image for scripts in the '...

... Hello World!' tutorial

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content/doc/pipeline/tour/hello-world.adoc

@@ -110,7 +110,7 @@ node {
 // Declarative //
 /* Requires the Docker Pipeline plugin */
 pipeline {
-    agent { docker { image 'ruby:3.3.5-alpine3.20' } }
+    agent { docker { image 'ruby:3.3.6-alpine3.20' } }
     stages {
         stage('build') {
             steps {
@@ -123,7 +123,7 @@ pipeline {
 /* Requires the Docker Pipeline plugin */
 node {
     stage('Build') {
-        docker.image('ruby:3.3.5-alpine3.20').inside {
+        docker.image('ruby:3.3.6-alpine3.20').inside {
             sh 'ruby --version'
         }
     }