[net8.0] This is preview 4 now.

Make.config

@@ -109,7 +109,7 @@ endif
 ##
 ## Note that the prerelease identifier should be as short as possible, because otherwise
 ## the resulting package name can become too long for MSIs.
-NUGET_HARDCODED_PRERELEASE_IDENTIFIER=net8-p3
+NUGET_HARDCODED_PRERELEASE_IDENTIFIER=net8-p4
 NUGET_HARDCODED_PRERELEASE_BRANCH=net8.0
 
 # compute the alphanumeric version of branch names