Bump to node20

node16 is deprecated, see https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/

action.yml

@@ -9,7 +9,7 @@ inputs:
     description: "Used to pull the latest release from sccache. When running this action outside of github.com, you have to pass a personal access token for github.com."
     default: ${{ github.server_url == 'https://github.com' && github.token || '' }}
 runs:
-  using: "node16"
+  using: "node20"
   main: "dist/setup/index.js"
   post: "dist/show_stats/index.js"
 branding: