scripted-diff: Use new python 3.7 keywords

-BEGIN VERIFY SCRIPT-
 sed -i 's/universal_newlines/text/g' $(git grep -l universal_newlines)
-END VERIFY SCRIPT-

test/lint/lint-locale-dependence.py

@@ -223,7 +223,7 @@ def find_locale_dependent_function_uses():
     git_grep_output = list()
 
     try:
-        git_grep_output = check_output(git_grep_command, universal_newlines=True, encoding="utf8").splitlines()
+        git_grep_output = check_output(git_grep_command, text=True, encoding="utf8").splitlines()
     except CalledProcessError as e:
         if e.returncode > 1:
             raise e