chore: add different neovim versions to the ci tests

Author: rcasia

.github/workflows/ci-pipeline.yml

@@ -14,13 +14,15 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest]
+        nvim-version: [stable, nightly]
     steps:
       - name: checkout
         uses: actions/checkout@v5
 
       - uses: rhysd/action-setup-vim@v1
         with:
           neovim: true
+          version: ${{ matrix.nvim-version }}
 
       - name: Run tests
         run: make test