Fix CI.

.github/workflows/test.yml

@@ -50,6 +50,7 @@ jobs:
         run: |
           python3 -m pip install --upgrade pip pytest
           pip install k2==${{ matrix.k2-version }}+cpu.torch${{ matrix.torch }} -f https://k2-fsa.org/nightly/
+          pip install git+https://github.com/lhotse-speech/lhotse
           # icefall requirements
           pip install -r requirements.txt