Update TensorFlow script

tools/tf

@@ -49,8 +49,8 @@ install() {
         return
     fi
     venv
-    ${python} -m pip install --quiet --upgrade --use-feature=2020-resolver wheel
-    ${python} -m pip install --quiet --upgrade --use-feature=2020-resolver tf-nightly
+    ${python} -m pip install --quiet --upgrade wheel
+    ${python} -m pip install --quiet --upgrade tf-nightly
     deactivate
 }