docs: update RECURITY.md (trivy, dockle -> grype)

Author: KEINOS

.github/SECURITY.md

@@ -19,7 +19,9 @@ As a minimum security measure, we take the following:
 - Image Scan
   - The following services are used to check the vulnerability of the created images.
     - [Snyk Docker Action](https://github.com/snyk/actions/tree/master/docker)
-    - [Azure Container Scan Action](https://github.com/Azure/container-scan) (Both Trivy and Dockle)
+    - [Grype Container Scan](https://github.com/anchore/scan-action)
   - Images are scanned on:
     - push, pull request, and merge.
     - The Dockerfile is also scanned on a weekly basis.
+
+> __Note__: As of Aug 3, 2023, [Azure Container Scan Action](https://github.com/Azure/container-scan) (for both Trivy and Dockle) is deprecated. We've replaced with [Grype Container Scan](https://github.com/anchore/scan-action).