Remove 2.11. (opensearch-project#583)

Signed-off-by: dblock <dblock@amazon.com>

Author: dblock

.github/workflows/integration.yml

@@ -9,7 +9,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        opensearch_version: [ '1.0.1', '1.1.0', '1.2.4', '1.3.7', '2.0.1', '2.1.0', '2.2.1', '2.3.0', '2.4.0', '2.5.0', '2.6.0', '2.7.0', '2.8.0', '2.9.0', '2.10.0', '2.11.0' ]
+        opensearch_version: [ '1.0.1', '1.1.0', '1.2.4', '1.3.7', '2.0.1', '2.1.0', '2.2.1', '2.3.0', '2.4.0', '2.5.0', '2.6.0', '2.7.0', '2.8.0', '2.9.0', '2.10.0' ]
         secured: [ "true", "false" ]
 
     steps: