.github: Update github-script to v7 and fix a rest bug

Need to update the github-script to v7 to squash deprecation
warnings.

Also fixed the API name for github.rest.pulls.requestReviewers.

.github/workflows/PRSubmitActions.yml

@@ -17,7 +17,7 @@ jobs:
     steps:
       - name: Get PR Number
         id: getpr
-        uses: actions/github-script@v6
+        uses: actions/github-script@v7
         with:
           retries: 5
           script: |
@@ -35,7 +35,7 @@ jobs:
 
       - name: Set Label
         id: setlabel
-        uses: actions/github-script@v6
+        uses: actions/github-script@v7
         env:
           PR_NUMBER:  ${{ steps.getpr.outputs.PR_NUMBER }}
           LABEL_TIP:  ${{ vars.PR_SUBMIT_TESTING_IN_PROGRESS }}
@@ -75,7 +75,7 @@ jobs:
 
       - name: Add cherry-pick reminder
         if: github.event.action == 'completed'
-        uses: actions/github-script@v6
+        uses: actions/github-script@v7
         env:
           PR_NUMBER:            ${{steps.getpr.outputs.PR_NUMBER}}
           CHERRY_PICK_REMINDER: ${{vars.CHERRY_PICK_REMINDER}}
@@ -117,7 +117,7 @@ jobs:
 
       - name: Add reviewers
         if: github.event.action == 'completed'
-        uses: actions/github-script@v6
+        uses: actions/github-script@v7
         env:
           PR_NUMBER: ${{steps.getpr.outputs.PR_NUMBER}}
           REVIEWERS: ${{vars.PR_REVIEWERS}}
@@ -137,7 +137,7 @@ jobs:
             if (teams.length > 0 || users.length > 0) {
               core.info(`Adding user reviewers ${users}`);
               core.info(`Adding team reviewers ${teams}`);
-              await github.pulls.requestReviewers({
+              await github.rest.pulls.requestReviewers({
                 pull_number: process.env.PR_NUMBER,
                 owner: context.repo.owner,
                 repo: context.repo.repo,