upgrade to pnpm 9 and fix broken pnpm setup

Author: benmccann

.github/workflows/release.yml

@@ -22,8 +22,6 @@ 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@v4
-        with:
-          version: 8.6.2
       - name: Setup Node.js
         uses: actions/setup-node@v4
         with:

package.json

@@ -10,8 +10,8 @@
 		"ci:release": "changeset publish",
 		"ci:version": "changeset version"
 	},
-	"packageManager": "pnpm@8.1.0",
+	"packageManager": "pnpm@9.6.0",
 	"engines": {
-		"pnpm": "^8.0.0"
+		"pnpm": "^9.0.0"
 	}
 }