update RELEASE for default 7.0.3.1 base

configure/RELEASE

 #
-EPICS_BASE=/epics/base-7.0.3
+EPICS_BASE:=/epics/base-7.0.3.1
 
 E3_REQUIRE_NAME:=require
-
 E3_REQUIRE_VERSION:=3.1.2
 
-
 # The definitions shown below can also be placed in an untracked RELEASE.local
 -include $(TOP)/../../RELEASE.local
 -include $(TOP)/../RELEASE.local