Decrease Python to 3.7 and set scipy to 1.7.2

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

Author: Beat Buesser

.github/workflows/ci-tensorflow-v1.yml

@@ -25,9 +25,9 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - name: TensorFlow 1.15.5 (Keras 2.2.5 Python 3.8)
+          - name: TensorFlow 1.15.5 (Keras 2.2.5 Python 3.7)
             framework: tensorflow
-            python: 3.8
+            python: 3.7
             tensorflow: 1.15.5
             tf_version: v1
             keras: 2.2.5
@@ -45,7 +45,8 @@ jobs:
           sudo apt-get update
           sudo apt-get -y -q install ffmpeg libavcodec-extra
           python -m pip install --upgrade pip setuptools wheel
-          pip install -r requirements_test.txt
+          pip install -q -r <(sed '/^scipy/d' requirements_test.txt)
+          pip install scipy==1.7.2
           pip install tensorflow==${{ matrix.tensorflow }}
           pip install keras==${{ matrix.keras }}
           pip list