Update pandas for Lingvo

Signed-off-by: Beat Buesser <[email protected]>

Author: Beat Buesser

.github/workflows/ci-lingvo.yml

@@ -47,9 +47,10 @@ jobs:
           sudo apt-get update
           sudo apt-get -y -q install ffmpeg libavcodec-extra
           python -m pip install --upgrade pip setuptools wheel
-          pip install -q -r <(sed '/^scipy/d;/^matplotlib/d' requirements.txt)
+          pip install -q -r <(sed '/^scipy/d;/^matplotlib/d;/^pandas/d' requirements.txt)
           pip install scipy==1.5.4
           pip install matplotlib==3.3.4
+          pip install pandas==1.1.5
           pip install tensorflow==${{ matrix.tensorflow }}
           pip install keras==${{ matrix.keras }}
           pip install lingvo==${{ matrix.lingvo }}