chore: Revert pnpm (#9976)

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---

## PR-Codex overview
This PR updates the package manager to `[email protected]` and makes changes
to package resolutions in the `pnpm-lock.yaml`.

### Detailed summary
- Updated packageManager to `[email protected]` in `package.json`
- Updated `pnpm` version to `8.15.6` in `volta` section of
`package.json`
- Updated `lockfileVersion` to `'6.0'` in `pnpm-lock.yaml`
- Changed package resolutions in the `pnpm-lock.yaml` file

> The following files were skipped due to too many changes:
`pnpm-lock.yaml`

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package.json

@@ -8,7 +8,7 @@
     "apis/*",
     "scripts"
   ],
-  "packageManager": "pnpm@9.1.4",
+  "packageManager": "pnpm@8.15.6",
   "scripts": {
     "preinstall": "npx only-allow pnpm",
     "dev": "turbo run dev --filter=web... --parallel --continue",
@@ -74,7 +74,7 @@
   },
   "volta": {
     "node": "20.12.2",
-    "pnpm": "9.1.4"
+    "pnpm": "8.15.6"
   },
   "dependencies": {
     "ws": "^8.13.0",