Update couchbase-server (docker-library#20222)

Co-authored-by: Couchbase Build Team <build-team@couchbase.com>

Author: 2 people

library/couchbase

@@ -11,6 +11,11 @@ GitCommit: e2600d59a2b84984adeccbe1c0f8b5d926d4b529
 Directory: community/couchbase-server/8.0.0
 Architectures: amd64, arm64v8
 
+Tags: 7.6.8, enterprise-7.6.8
+GitCommit: 79e990af7621fa397c0dc12fd08bad6db4f49476
+Directory: enterprise/couchbase-server/7.6.8
+Architectures: amd64, arm64v8
+
 Tags: 7.6.7, enterprise-7.6.7
 GitCommit: a322cc7110124b2581339f52d88bab80fb50016d
 Directory: enterprise/couchbase-server/7.6.7