chore: bump pnpm to 9.x.x in CI workflows

Author: billyb2

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
       - name: Install pnpm
         uses: pnpm/action-setup@v4.0.0
         with:
-          version: 8.x.x
+          version: 9.x.x
 
       - name: Install Node 18
         uses: actions/setup-node@v4
@@ -79,7 +79,7 @@ jobs:
       - name: Install pnpm
         uses: pnpm/action-setup@v4.0.0
         with:
-          version: 8.x.x
+          version: 9.x.x
 
       - name: Install Node 18
         uses: actions/setup-node@v4

.github/workflows/release.yml

@@ -20,7 +20,7 @@ jobs:
       - name: Install pnpm
         uses: pnpm/action-setup@v4.0.0
         with:
-          version: 8.x.x
+          version: 9.x.x
 
       - name: Install Node 18
         uses: actions/setup-node@v4