remove redundant \d in check regex

Author: sfewer-r7

modules/exploits/linux/misc/cisco_ios_xe_rce.rb

@@ -146,7 +146,7 @@ def check
     # (as the above call to run_cli_command succeeded), however maybe this firmware version uses a different format
     # for the version information so our regex wont work.
     # Note: Version numbers can have letters in them, e.g. 17.11.99SW or 16.12.1z2
-    if res =~ /(Cisco IOS XE Software, Version [\d\S]+\.[\d\S]+\.[\d\S]+)/
+    if res =~ /(Cisco IOS XE Software, Version \S+\.\S+\.\S+)/
       version = Regexp.last_match(1)
     end