fix(deps): bump nodejs action to 20

```
Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: tradeshift/actions-docker@v1. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.
```

action.yml

@@ -95,6 +95,6 @@ outputs:
   image:
     description: full image name including git SHA tag
 runs:
-  using: "node16"
+  using: "node20"
   main: "dist/index.js"
   post: "dist/index.js"