gh-140145: Use repr of the key in `zoneinfo` "No time zone found" error (#140433)

Co-authored-by: Stan Ulbrych <stan@python.org>

Lib/zoneinfo/_common.py

diff --git a/Lib/zoneinfo/_common.py b/Lib/zoneinfo/_common.py
index 98668c1..caa3a5b 100644
--- a/Lib/zoneinfo/_common.py
+++ b/Lib/zoneinfo/_common.py
@@ -26,7 +26,7 @@ def load_tzdata(key):
         # UnicodeEncodeError: If package_name or resource_name are not UTF-8,
         #   such as keys containing a surrogate character.
         # IsADirectoryError: If package_name without a resource_name specified.
-        raise ZoneInfoNotFoundError(f"No time zone found with key {key}")
+        raise ZoneInfoNotFoundError(f"No time zone found with key {key!r}")
 
 
 def load_data(fobj):