ci(dev-deps): update pnpm/action-setup action to v4 (#962)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/actions/prepare/action.yml

@@ -15,7 +15,7 @@ runs:
         git config --global user.email "${GITHUB_ACTOR}@users.noreply.github.com"
         git config --global user.name ${GITHUB_ACTOR}
       shell: bash
-    - uses: pnpm/action-setup@v2
+    - uses: pnpm/action-setup@v4
     - uses: actions/setup-node@v4
       with:
         node-version: ${{ inputs.node-version }}