Update Test to use main branch of nvim-treesitter

Author: Badhi

.github/workflows/unit_tests.yml

@@ -39,7 +39,7 @@ jobs:
           git clone https://github.com/nvim-lua/plenary.nvim
           mkdir -p ~/.local/share/nvim/site/pack/nvim-treesitter/start
           cd ~/.local/share/nvim/site/pack/nvim-treesitter/start
-          git clone https://github.com/nvim-treesitter/nvim-treesitter.git
+          git clone -b "${{ github.ref_name }}" https://github.com/nvim-treesitter/nvim-treesitter.git
          
       - name: Setup nvim and tree sitter
         env: