Update node version to node20 (#300)

Co-authored-by: ryudai.takai

Author: ryudaitakai

action.yml

@@ -81,7 +81,7 @@ outputs:
     description: Full hash of the created commit. Only present if the "changes_detected" output is "true".
 
 runs:
-  using: 'node16'
+  using: 'node20'
   main: 'index.js'
 
 branding: