runtime(keymap) Add forward slash (/) to russian-jcukenwin keymap

closes: #16912

Signed-off-by: Marat Amerov <maratamerov@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/keymap/russian-jcukenwin.vim b/runtime/keymap/russian-jcukenwin.vim
index d56470f..58eac10 100644
--- a/runtime/keymap/russian-jcukenwin.vim
+++ b/runtime/keymap/russian-jcukenwin.vim
@@ -4,6 +4,7 @@
 
 " Maintainer:   Artem Chuprina <ran@ran.pp.ru>
 " Last Changed: 2001 Jun 23
+" 2025 Mar 17 by The Vim Project (added /, #16912)
 
 " All characters are given literally, conversion to another encoding (e.g.,
 " UTF-8) should work.
@@ -85,3 +86,4 @@
 &	?
 /	.
 ?	,
+\|	/