chore(storage): release 1.15.0 (#3982)

Release-As: 1.15.0
diff --git a/storage/CHANGES.md b/storage/CHANGES.md
index 5e3291e..4c122dc 100644
--- a/storage/CHANGES.md
+++ b/storage/CHANGES.md
@@ -109,4 +109,3 @@
 
 This is the first tag to carve out storage as its own module. See:
 https://github.com/golang/go/wiki/Modules#is-it-possible-to-add-a-module-to-a-multi-module-repository.
-