fix: remove pnpm version override — reads from packageManager in package.json

pnpm/action-setup@v4 auto-detects version from the packageManager field
in package.json (pnpm@9.15.0). Specifying version: 9 in the action
caused ERR_PNPM_BAD_PM_VERSION conflict.

Author: codercatdev

.github/workflows/deploy.yml

@@ -12,8 +12,6 @@ jobs:
       - uses: actions/checkout@v4
 
       - uses: pnpm/action-setup@v4
-        with:
-          version: 9
 
       - uses: actions/setup-node@v4
         with: