fix: GitHub now requires using node 20

SychO9 · SychO9 · commit 73c39c9b1e6e · 2024-09-28T15:04:06.000+01:00
diff --git a/action.yml b/action.yml
@@ -2,7 +2,7 @@ name: Flarum JavaScript Build
 description: Automatically compile your extension's JavaScript files
 author: 'Flarum'
 runs:
-  using: 'node16'
+  using: 'node20'
   main: 'dist/index.js'
 inputs:
   github_token:
