ci: corrected Neovim version in panvimdoc

Author: folke

.github/workflows/ci.yml

@@ -26,6 +26,7 @@ jobs:
         uses: kdheepak/panvimdoc@main
         with:
           vimdoc: lazy.nvim
+          version: "Neovim >= 0.8.0"
           demojify: true
       - name: Code Blocks
         run: sed -i 's/^>$/>lua/' doc/lazy.nvim.txt