chore(repo): ensure actions runs use consistent pnpm version (#29337)

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## Current Behavior
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Fixes #

.github/workflows/generate-embeddings.yml

@@ -22,10 +22,10 @@ jobs:
           node-version: 18
 
       - name: Install pnpm
-        uses: pnpm/action-setup@v2
+        uses: pnpm/action-setup@v4
         id: pnpm-install
         with:
-          version: 8
+          version: 9.8.0
           run_install: false
 
       - name: Get pnpm store directory

.github/workflows/issue-notifier.yml

@@ -18,9 +18,9 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v3
 
-      - uses: pnpm/action-setup@v2
+      - uses: pnpm/action-setup@v4
         with:
-          version: 8
+          version: 9.8.0
 
       - name: Use Node.js ${{ matrix.node_version }}
         uses: actions/setup-node@v3