Add tests in CI

Author: cbornet

.github/workflows/lint.yml

@@ -18,7 +18,7 @@ jobs:
         working-directory: ./langchain
     strategy:
       matrix:
-        python-version: ['3.8', '3.13']
+        python-version: ['3.9', '3.13']
     steps:
       - uses: actions/checkout@v4
         with: