fix: docgen ci failure (#2323)

.github/workflows/docgen.yml

@@ -13,7 +13,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: ubuntu-20.04
+          - os: ubuntu-22.04
             url: https://github.com/neovim/neovim/releases/download/nightly/nvim-linux64.tar.gz
     steps:
       - uses: actions/checkout@v3
@@ -32,7 +32,7 @@ jobs:
           }
           mkdir -p ~/.local/share/nvim/site/pack/vendor/start
           git clone --depth 1 https://github.com/nvim-lua/plenary.nvim ~/.local/share/nvim/site/pack/vendor/start/plenary.nvim
-          git clone --depth 1 https://github.com/tjdevries/tree-sitter-lua ~/.local/share/nvim/site/pack/vendor/start/tree-sitter-lua
+          git clone https://github.com/tjdevries/tree-sitter-lua ~/.local/share/nvim/site/pack/vendor/start/tree-sitter-lua
           ln -s $(pwd) ~/.local/share/nvim/site/pack/vendor/start
 
       - name: Build parser