Make the 'not found' regex case sensitive (#27100)

Turns out in some commands, like 'sh bgp summary' a line containing
'Not found' can be shown as a column.
This causes those commands to error out with RC=1 .

Fixes #26577

lib/ansible/plugins/terminal/ios.py

@@ -41,7 +41,7 @@ class TerminalModule(TerminalBase):
         re.compile(br"invalid input", re.I),
         re.compile(br"(?:incomplete|ambiguous) command", re.I),
         re.compile(br"connection timed out", re.I),
-        re.compile(br"[^\r\n]+ not found", re.I),
+        re.compile(br"[^\r\n]+ not found"),
         re.compile(br"'[^']' +returned error code: ?\d+"),
     ]