Update test.yml

Author: karen-avetisyan-mc

.github/workflows/test.yml

@@ -18,8 +18,11 @@ jobs:
           - 3.8
           - 3.9
         include:
-            - os: "ubuntu-20.04"
-              python-version: "3.9"          
+          - os: "ubuntu-latest"
+          # There is no build for Python 3.9 in ubuntu>20.04.
+          # This unclude can be removed when we drop support for Python 3.6.
+          - os: "ubuntu-20.04"
+            python-version: "3.9"
     steps:
       - uses: actions/checkout@v2
         with:
@@ -30,7 +33,6 @@ jobs:
           python-version: '${{ matrix.python-version }}'
       - name: Install dependencies
         run: |
-          pip install --upgrade pip
           pip3 install -r requirements.txt
           pip3 install .
           pip3 install coverage