changes: Add changes file for ticket 33458

Signed-off-by: David Goulet <dgoulet@torproject.org>

changes/ticket33458

+  o Minor bugfix (onion service v3):
+    - When cleaning the client descriptor cache, an attempt at closing circuits
+      for a non decrypted descriptor (lacking client authorization) lead to an
+      assert(). Fixes bug 33458; bugfix on 0.4.2.1-alpha.