fix workflow again: env setting line won't expand $HOME:(

Tag the head revision as renv-v2(not v2 to avoid conflict with upstream)
and use it.

.github/workflows/deploy_bookdown.yml

@@ -17,11 +17,9 @@ jobs:
       - uses: r-lib/actions/setup-pandoc@v1
         with:
           pandoc-version: '2.11'
-      - uses: foxsen/actions/setup-renv@v1
+      - uses: foxsen/actions/setup-renv@renv-v2
         with:
           cache-version: 1
-        env: 
-          RENV_PATHS_ROOT: $HOME/.local/share/renv
       - name: Install Noto CJK fonts
         run: sudo apt-get install -y fonts-noto-cjk
       - name: Render Book