ops: update pip installation command

Author: lemorage

.github/workflows/_test.yml

@@ -43,7 +43,7 @@ jobs:
         - name: Install Python toolchains
           run: |
             source .venv/bin/activate
-            pip install maturin pytest mypy
+            pip install maturin mypy pytest pytest-asyncio
         - name: Python build
           run: |
             source .venv/bin/activate

docs/docs/about/contributing.md

@@ -46,7 +46,7 @@ Following the steps below to get cocoindex build on latest codebase locally - if
 
 -   Install required tools:
     ```sh
-    pip install maturin mypy pre-commit
+    pip install maturin mypy pre-commit pytest pytest-asyncio
     ```
 
 -   Build the library. Run at the root of cocoindex directory: