remove 2.6.0

Author: zanshuxun

.github/workflows/ci.yml

@@ -18,7 +18,7 @@ jobs:
     strategy:
       matrix:
         python-version: [3.7,3.8,3.9,3.10.7]
-        tf-version: [1.9.0,1.14.0,2.5.0,2.6.0]
+        tf-version: [1.9.0,1.14.0,2.5.0]
 
         exclude:
           - python-version: 3.7