Update stable env to latest sdfabric-onos image (#295)

Co-authored-by: daniele-moro <daniele-moro@users.noreply.github.com>

Author: onf-bot

.env.stable

@@ -2,12 +2,9 @@
 # SPDX-License-Identifier: Apache-2.0
 #
 
-ONOS_VERSION=refs/changes/47/25447/8
-TRELLIS_CONTROL_VERSION=3.3.0-SNAPSHOT
-FABRIC_TNA_VERSION=split_read_counters
 
 PFCP_AGENT_IMAGE=omecproject/upf-epc-pfcpiface:master-2f04e3a
-ONOS_IMAGE=sdfabric-onos-local:master
+ONOS_IMAGE=opennetworking/sdfabric-onos@sha256:5b0dcf9e60b90186c110bc6c016ca11043812fb64c667f4964ce2b06ba9319e9
 PFCPSIM_IMAGE=opennetworking/pfcpsim:64474e9
 ATOMIX_IMAGE=atomix/atomix:3.1.12
 DBUF_IMAGE=opennetworking/dbuf:1.0.0