lint: specify encoding when using 'open'

vunit/test/runner.py

@@ -307,7 +307,7 @@ def _print_output(self, output_file_name):
         """
         Print contents of output file if it exists
         """
-        with Path(output_file_name).open("r") as fread:
+        with Path(output_file_name).open("r", encoding="utf-8") as fread:
             for line in fread.readlines():
                 self._stdout_ansi.write(line)
 

vunit/ui/__init__.py

@@ -248,7 +248,7 @@ def add_source_files_from_csv(self, project_csv_path: Union[str, Path], vhdl_sta
 
         ppath = Path(project_csv_path)
 
-        with ppath.open() as csv_path_file:
+        with ppath.open("r", encoding="utf-8") as csv_path_file:
             for row in csv.reader(csv_path_file):
                 if len(row) == 2:
                     lib_name = row[0].strip()
@@ -828,7 +828,7 @@ def _main_export_json(self, json_file_name: Union[str, Path]):  # pylint: disabl
             tests=tests,
         )
 
-        with Path(json_file_name).open("w") as fptr:
+        with Path(json_file_name).open("w", encoding="utf-8") as fptr:
             json.dump(json_data, fptr, sort_keys=True, indent=4, separators=(",", ": "))
 
         return True