chore: update pull_request_approved workflow (#60537)

## Description
Updating
https://github.com/vercel/next.js/blob/canary/.github/workflows/pull_request_approved.yml
and related.

## Changes
- Fix path so workflow runs
- Update cron schedule to be on a weekly basis on instead of daily
- Update Slack channel

Closes NEXT-2068

---------

Co-authored-by: JJ Kasper <jj@jjsweb.site>

.github/actions/pr-approved-open/src/index.mjs

@@ -20,9 +20,9 @@ async function run() {
 
     if (pendingPRs) {
       await slackClient.chat.postMessage({
-        channel: '#coord-next-turbopack',
-        text: `🤖 Pending PRs for Next.js: There are <https://github.com/vercel/next.js/pulls?q=is%3Apr+is%3Aopen+review%3Aapproved+-is%3Adraft|${prs.data.items.length} PRs> awaiting merge.`,
-        username: 'GitHub Notifier',
+        channel: '#next-js-repo-udpates',
+        text: `Pending PRs for Next.js: There are <https://github.com/vercel/next.js/pulls?q=is%3Apr+is%3Aopen+review%3Aapproved+-is%3Adraft|${prs.data.items.length} PRs> awaiting merge.`,
+        username: 'GitHub',
         icon_emoji: ':github:',
       })
 

.github/workflows/pull_request_approved.yml

@@ -2,7 +2,7 @@ name: Notify about approved but still open PRs
 
 on:
   schedule:
-    - cron: '0 0 * * *' # Once a day
+    - cron: '0 13 2-30/2 * *' # Every even day of the month at 1PM UTC (9AM EST)
   workflow_dispatch:
 
 jobs:
@@ -16,7 +16,7 @@ jobs:
           node-version: 18
       - run: corepack enable
       - name: 'Send notification to Slack'
-        run: node ./.github/actions/pr-approved-open/index.mjs
+        run: node ./.github/actions/pr-approved-open/dist/index.mjs
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SLACK_TOKEN: ${{ secrets.SLACK_TOKEN }}