Remove some unnecessary utf-8 references

test/run.py

@@ -400,7 +400,7 @@ def collect_dir_tests(base_dir, test_files, check_thirdparty=False):
 
             path = os.path.join(base_dir, f_name)
 
-            with open(path, encoding='utf-8', newline='') as f:
+            with open(path, newline='') as f:
                 source = f.read()
 
             for case in collect_file_tests(path, StringIO(source),

test/test_api/test_unicode.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 """
 All character set and unicode related tests.
 """

test/test_deprecation.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 import warnings
 
 import pytest

test/test_parso_integration/test_parser_utils.py

@@ -1,4 +1,3 @@
-# -*- coding: utf-8 -*-
 from jedi import parser_utils
 from parso import parse
 from parso.python import tree