Update default runtime to node16

Node 12 has an end of life on April 30, 2022. This PR updates the default runtime to [node16](https://github.blog/changelog/2021-12-10-github-actions-github-hosted-runners-now-run-node-js-16-by-default/), rather then node12. This is supported on all Actions Runners v2.285.0 or later.
actions · Feb 7, 2022 · 6467b96 · 6467b96
1 parent 8af6051
commit 6467b96
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/action.yml b/action.yml
@@ -198,5 +198,5 @@ outputs:
   staled-issues-prs:
     description: 'List of all staled issues and pull requests.'
 runs:
-  using: 'node12'
+  using: 'node16'
   main: 'dist/index.js'