Merge branch 'net9.0' into dev/rolf/bump-main-in-net9.0-2024-09-24

Make.config

@@ -140,7 +140,7 @@ 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=net9-rc2
+NUGET_HARDCODED_PRERELEASE_IDENTIFIER=net9-rtm
 NUGET_HARDCODED_PRERELEASE_BRANCH=net9.0
 
 # compute the alphanumeric version of branch names