[release/6.0.3xx] Fix release branch naming. (#15291)

Author: rolfbjarne

Make.config

@@ -88,7 +88,7 @@ NUGET_HARDCODED_PRERELEASE_IDENTIFIER=
 # Set the NUGET_HARDCODED_PRERELEASE_BRANCH variable to the exact name for the branch the above variable should apply to (so that any other branches won't pick it up by accident).
 # For the previous example, this would be "release/6.0.2xx-rc1"
 # When creating a (pre) release branch from main, this must be changed from "main" to the new release branch.
-NUGET_HARDCODED_PRERELEASE_BRANCH=release/6.0.4xx
+NUGET_HARDCODED_PRERELEASE_BRANCH=release/6.0.3xx
 
 # compute the alphanumeric version of the hardcoded prerelease branch
 NUGET_HARDCODED_PRERELEASE_BRANCH_ALPHANUMERIC:=$(shell export LANG=C; printf "%s" "$(NUGET_HARDCODED_PRERELEASE_BRANCH)" | tr -c '[a-zA-Z0-9-]' '-')