docs: update issue template

Author: setchy

.github/ISSUE_TEMPLATE/bug_report.yml

@@ -38,6 +38,7 @@ body:
       label: Gitify Version
       description: What version of Gitify are you using?
       options:
+        - 5.3.0
         - 5.2.0
         - 5.1.0
         - 5.0.0