chore: change Database to required

Author: kenjis

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -80,7 +80,7 @@ body:
       label: Database
       description: e.g. MySQL 5.6, MariaDB 10.2, PostgreSQL 9.6
     validations:
-      required: false
+      required: true
 
   - type: textarea
     id: description