build: Ensure we use pnpm 9.4.0 everywhere on CI (#12772)

Just to align stuff properly everywhere!

Author: mydea

.github/workflows/build.yml

@@ -1252,7 +1252,7 @@ jobs:
           ref: ${{ env.HEAD_COMMIT }}
       - uses: pnpm/action-setup@v4
         with:
-          version: 8.3.1
+          version: 9.4.0
       - name: Set up Node
         uses: actions/setup-node@v4
         with:

.github/workflows/canary.yml

@@ -103,7 +103,7 @@ jobs:
           ref: ${{ env.HEAD_COMMIT }}
       - uses: pnpm/action-setup@v4
         with:
-          version: 8.3.1
+          version: 9.4.0
 
       - name: Set up Node
         uses: actions/setup-node@v4