[Python-checkins] Fix EncodingWarning in libregrtest (GH-31654)

[methane]

https://github.com/python/cpython/commit/3c4abfab0d3e2a3b1e626a5eb185ad1f5436b532
commit: 3c4abfab0d3e2a3b1e626a5eb185ad1f5436b532
branch: main
author: Inada Naoki <songofacandy at gmail.com>
committer: methane <songofacandy at gmail.com>
date: 2022-03-03T16:19:56+09:00
summary:

Fix EncodingWarning in libregrtest (GH-31654)

files:
M Lib/test/libregrtest/refleak.py

diff --git a/Lib/test/libregrtest/refleak.py b/Lib/test/libregrtest/refleak.py
index 1069e2da008ff..a0538cbb3c377 100644
--- a/Lib/test/libregrtest/refleak.py
+++ b/Lib/test/libregrtest/refleak.py
@@ -142,7 +142,7 @@ def check_fd_deltas(deltas):
             msg = '%s leaked %s %s, sum=%s' % (
                 test_name, deltas, item_name, sum(deltas))
             print(msg, file=sys.stderr, flush=True)
-            with open(fname, "a") as refrep:
+            with open(fname, "a", encoding="utf-8") as refrep:
                 print(msg, file=refrep)
                 refrep.flush()
             failed = True