ci(datasets): install deps in single pip install (#454)

Signed-off-by: Deepyaman Datta <[email protected]>

.github/workflows/kedro-datasets.yml

@@ -55,8 +55,7 @@ jobs:
         run: |
           python -m pip install -U "pip>=21.2,<23.2" # Temporary fix
           cd kedro-datasets
-          pip install ".[docs]"
-          pip install ".[test]"
+          pip install ".[docs,test]"
       - name: RTD build for kedro-datasets
         run: |
           make rtd