Add Release Notes for v1.10.4

WHATSNEW.md

+osTicket v1.10.4
+================
+### Enhancements
+* issue: Auto-Assignment Log (#4316)
+* issue: Language Pack Locale Mismatch (#4326)
+* issue: CLI Deploy Missing Bootstrap (#4332)
+* issue: User Import No Email (#4330)
+* issue: Ticket Lock On Disable (#4335)
+
+### Performance and Security
+* security: Fix Multiple XSS Vulnerabilities (#4331)
+* department: Error Feedback (#4331)
+
+
 osTicket v1.10.3
 ================
 ### Enhancements