feat: use node20 as runner (actions#23)

gr2m · web-flow · commit 803e078eb599 · 2023-08-22T10:24:39.000-07:00
should be available now as per actions/runner#2619 (comment)
diff --git a/action.yml b/action.yml
@@ -15,6 +15,6 @@ outputs:
   token:
     description: "GitHub installation access token"
 runs:
-  using: "node16"
+  using: "node20"
   main: "dist/main.cjs"
   post: "dist/post.cjs"
