Minor fix for GitHub actions

.github/workflows/CI-v1.yml

@@ -48,7 +48,7 @@ jobs:
       # To force Pydantic v1, we install the package before the dependencies. This
       # simulates a user who has Pydantic v1 required from another package. 
       - name: Install Pydantic v1
-        run: poetry run pip install pydantic==1.8.2
+        run: poetry add pydantic==1.8.2
 
       # Install dependencies. This function will take the already installed Pydantic v1
       - name: Install Dependencies