chore(workflow): update test-add-replica-matrix to use single version

- Removed version `2021.7.9` from the matrix, leaving only `2023.8.0`.

This change simplifies the testing matrix by focusing on the latest version.

.github/workflows/test-add-replica-matrix.yaml

@@ -36,7 +36,7 @@ jobs:
       fail-fast: false
       matrix:
         architecture: [standard, standard-with-dr, large, extra-large]
-        version: [2021.7.9, 2023.8.0]
+        version: 2023.8.0
         image: [almalinux-cloud/almalinux-8]
     steps:
       - name: Checkout Source