ci: test against OpenSearch 3.7.0

Add 3.7.0 to the compatibility matrix (alongside latest, which will track
it) and bump the default integration OPENSEARCH_VERSION from 3.6.0 to 3.7.0
so the primary integration run exercises the latest pinned release.

Signed-off-by: Sean Chittenden <sean.chittenden@crowdstrike.com>

Author: sean-

.github/workflows/test-compatibility.yml

@@ -49,6 +49,7 @@ jobs:
           - { opensearch_version: 3.4.0, node_count: 3 }
           - { opensearch_version: 3.5.0, node_count: 3 }
           - { opensearch_version: 3.6.0, node_count: 3 }
+          - { opensearch_version: 3.7.0, node_count: 3 }
           - { opensearch_version: latest, node_count: 3 }
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6

.github/workflows/test-integration.yml

@@ -4,7 +4,7 @@ on: [push, pull_request]
 
 env:
   GITHUB_ACTIONS: true
-  OPENSEARCH_VERSION: 3.6.0
+  OPENSEARCH_VERSION: 3.7.0
   OPENSEARCH_NODE_COUNT: 3
   SECURE_INTEGRATION: true
   CONTAINER_RUNTIME: docker