Update jenkins image to a GA build (#7625)

Author: torcolvin

jenkins-integration-build.sh

@@ -25,7 +25,7 @@ if [ "${1:-}" == "-m" ]; then
     RUN_COUNT="1"
     # CBS server settings
     COUCHBASE_SERVER_PROTOCOL="couchbase"
-    COUCHBASE_SERVER_VERSION="ghcr.io/cb-vanilla/server:7.6.5-5535"
+    COUCHBASE_SERVER_VERSION="enterprise-7.6.6"
     SG_TEST_BUCKET_POOL_SIZE="3"
     SG_TEST_BUCKET_POOL_DEBUG="true"
     GSI="true"