Update ci settings

Author: lixfz

.github/workflows/python-pytest.yml

@@ -16,12 +16,16 @@ jobs:
       fail-fast: false
       matrix:
         python-version: [3.8, 3.9, ]
-        tf-version: [2.3.1, 2.4.2, 2.5.3, 2.6.4, 2.7.4, 2.8.4, 2.9.3]
+        tf-version: [2.5.3, 2.6.4, 2.7.4, 2.8.4, 2.9.3]
         include:
           - tf-version: 2.6.4
-            python-version: 3.10
+            python-version: "3.10"
           - tf-version: 2.6.4
             python-version: 3.9
+          - tf-version: 2.3.1
+            python-version: 3.8
+          - tf-version: 2.4.2
+            python-version: 3.8
 
     steps:
     - uses: actions/checkout@v2