Add SIEM package category (#5128)

Removed changes from:
- detection_rules/etc/packages.yaml

(selectively cherry picked from commit e147188)

Author: shashank-elastic

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "detection_rules"
-version = "1.4.5"
+version = "1.4.6"
 description = "Detection Rules is the home for rules used by Elastic Security. This repository is used for the development, maintenance, testing, validation, and release of rules for Elastic Security’s Detection Engine."
 readme = "README.md"
 requires-python = ">=3.12"