[CI] Update stale action version (#8618)

Add messages for PR actions.

Author: bader

.github/workflows/sycl_stale_issues.yml

@@ -8,10 +8,12 @@ jobs:
   close-issues:
     runs-on: ubuntu-20.04
     steps:
-    - uses: actions/stale@v4
+    - uses: actions/stale@v7
       with:
         stale-issue-message: 'This issue is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be automatically closed in 30 days.'
         close-issue-message: 'This issue was closed because it has been stalled for 30 days with no activity. Please, re-open if the issue still exists.'
+        stale-pr-message: 'This pull request is stale because it has been open 180 days with no activity. Remove stale label or comment or this will be automatically closed in 30 days.'
+        close-pr-message: 'This pull request was closed because it has been stalled for 30 days with no activity.'
         days-before-stale: 180
         days-before-close: 30
         exempt-issue-labels: 'confirmed,hip,cuda,enhancement,help wanted,upstream'