action.yml: Update to Node.js 20 (#1228)

Node.js 16 actions are deprecated.

This should suppress the deprecation notice: Please update the following actions to use Node.js 20: codecov/codecov-action@v3

Author: hallabro

action.yml

@@ -120,5 +120,5 @@ branding:
   color: 'red'
   icon: 'umbrella'
 runs:
-  using: 'node16'
+  using: 'node20'
   main: 'dist/index.js'