Properly sort release_config_contributions artifact

Bug: b/370544058
Test: manual
Change-Id: I33cdd1f3175c53867c1a0c96605a81d545cd3a8e

cmd/release_config/release_config_contributions/main.go

diff --git a/cmd/release_config/release_config_contributions/main.go b/cmd/release_config/release_config_contributions/main.go
index 6abf768..a954cf1 100644
--- a/cmd/release_config/release_config_contributions/main.go
+++ b/cmd/release_config/release_config_contributions/main.go
@@ -114,7 +114,7 @@
 	}
 	for _, name := range releaseConfigNames {
 		dirs := contributingDirsMap[name]
-		slices.Sort(dirs)
+		sortDirectories(dirs)
 		message.ReleaseConfigContributionsArtifactList = append(
 			message.ReleaseConfigContributionsArtifactList,
 			&rc_proto.ReleaseConfigContributionsArtifact{