[Security Rules] Update security rules package to v8.7.3 (#6007)

* [Security Rules] Update security rules package to v8.7.3

* Add changelog entry for 8.7.3

---------

Co-authored-by: protectionsmachine <[email protected]>

Author: terrancedejesus

packages/security_detection_engine/changelog.yml

@@ -1,5 +1,10 @@
 # newer versions go on top
 # NOTE: please use pre-release versions (e.g. -beta.0) until a package is ready for production
+- version: 8.7.3
+  changes:
+    - description: Release security rules update
+      type: enhancement
+      link: https://github.com/elastic/integrations/pull/6007
 - version: 8.7.3-beta.1
   changes:
     - description: Release security rules update

packages/security_detection_engine/manifest.yml

@@ -12,7 +12,7 @@ license: basic
 name: security_detection_engine
 owner:
   github: elastic/protections
-release: beta
+release: ga
 title: Prebuilt Security Detection Rules
 type: integration
-version: 8.7.3-beta.1
+version: 8.7.3