[release/4.x] Cherry pick: Update from Open Enclave 0.19.4 to 0.19.6 (#6262) (#6264)

Author: achamayou

getting_started/setup_vm/roles/openenclave/vars/common.yml

@@ -1,6 +1,6 @@
-oe_ver: "0.19.3"
+oe_ver: "0.19.6"
 # Usually the same, except for rc, where ver is -rc and ver_ is _rc
-oe_ver_: "0.19.3"
+oe_ver_: "0.19.6"
 
 # Source install
 workspace: "/tmp/"