chore: upgrade pnpm to version 9 (#11637)

Co-authored-by: Rich Harris <rich.harris@vercel.com>
Co-authored-by: Ben McCann <322311+benmccann@users.noreply.github.com>

Author: 3 people

.github/workflows/ci.yml

@@ -31,6 +31,8 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: pnpm/action-setup@v2.2.4
+        with:
+          version: 9
       - uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node-version }}
@@ -46,6 +48,8 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - uses: pnpm/action-setup@v2.2.4
+        with:
+          version: 9
       - uses: actions/setup-node@v3
         with:
           node-version: 18

.github/workflows/release.yml

@@ -22,6 +22,8 @@ jobs:
           # This makes Actions fetch all Git history so that Changesets can generate changelogs with the correct commits
           fetch-depth: 0
       - uses: pnpm/action-setup@v2.2.4
+        with:
+          version: 9
       - name: Setup Node.js
         uses: actions/setup-node@v3
         with:

package.json

@@ -5,9 +5,8 @@
   "private": true,
   "type": "module",
   "license": "MIT",
-  "packageManager": "pnpm@8.6.12",
   "engines": {
-    "pnpm": "^8.0.0"
+    "pnpm": "^9.0.0"
   },
   "repository": {
     "type": "git",