Issue #10955: zipimport uses ASCII at bootstrap

zipimport uses ASCII encoding instead of cp497 to decode filenames, at
bootstrap, if the codec registry is not ready yet. It is still possible to have
non-ASCII filenames using the Unicode flag (UTF-8 encoding) for file entries in
the ZIP file.
diff --git a/Misc/NEWS b/Misc/NEWS
index 0ae7d7d..e6a23bd 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -16,6 +16,11 @@
 Library
 -------
 
+- Issue #10955: zipimport uses ASCII encoding instead of cp497 to decode
+  filenames, at bootstrap, if the codec registry is not ready yet. It is still
+  possible to have non-ASCII filenames using the Unicode flag (UTF-8 encoding)
+  for file entries in the ZIP file.
+
 - Issue #10949: Improved robustness of rotating file handlers.
 
 - Issue #10955: Fix a potential crash when trying to mmap() a file past its