fix(ci): Add pnpm and Node.js setup to release workflow (#1247)

## Summary

Fix the release workflow which was failing with:
```
bash: scripts/bump-version.sh: line 19: pnpm: command not found
```

## Changes

Added pnpm and Node.js setup steps to the release workflow before Craft
runs the preReleaseCommand. This ensures `pnpm` is available when
`bump-version.sh` executes.

The setup steps match those used in `build.yml`:
- `pnpm/action-setup@v4` - reads pnpm version from `packageManager` in
package.json
- `actions/setup-node@v6` - reads Node version from the `volta` section
in package.json

Author: BYK

.github/workflows/release.yml

@@ -37,6 +37,15 @@ jobs:
           token: ${{ steps.token.outputs.token }}
           fetch-depth: 0
 
+      - name: Setup pnpm
+        uses: pnpm/action-setup@v4
+
+      - name: Set up Node
+        uses: actions/setup-node@v6
+        with:
+          node-version-file: "package.json"
+          cache: "pnpm"
+
       - name: Prepare release
         uses: getsentry/craft@1c58bfd57bfd6a967b6f3fc92bead2c42ee698ce # v2
         env: