Update pfcp-agent

To the same version tested with up4 contained in sdfabric-onos image:

    docker image inspect opennetworking/sdfabric-onos:master-2022-02-07 | grep org.omecproject.up4.version
        "org.omecproject.up4.version": "59857a4b0cbe7f2e0a71128929860db5a082bc0b",

    https://github.com/omec-project/up4/blob/59857a4b0cbe7f2e0a71128929860db5a082bc0b/.env.stable#L5

Change-Id: If311ede57e675654a0a66fdc98683ccd92910d0c
diff --git a/pfcp-agent/values.yaml b/pfcp-agent/values.yaml
index b32736c..6c854fe 100644
--- a/pfcp-agent/values.yaml
+++ b/pfcp-agent/values.yaml
@@ -5,7 +5,7 @@
 images:
   tags:
     init: registry.aetherproject.org/tools/busybox:stable
-    pfcpiface: omecproject/upf-epc-pfcpiface:master-fcdbc95
+    pfcpiface: omecproject/upf-epc-pfcpiface:master-675c303
   pullPolicy: Always
 
 nodeSelectors: