Updating changelog

CHANGES.txt

-2022-09-27 version 21.7 (C++/Java/Python/PHP/Objective-C/C#/Ruby)
+2022-09-29 version 21.7 (C++/Java/Python/PHP/Objective-C/C#/Ruby)
   Java
   * Refactoring java full runtime to reuse sub-message builders and prepare to
     migrate parsing logic from parse constructor to builder.

protobuf_deps.bzl

@@ -114,6 +114,6 @@ def protobuf_deps():
         _github_archive(
             name = "upb",
             repo = "https://github.com/protocolbuffers/upb",
-            commit = "333722e94b35c26b9eb48bd7e471235374ab3737",
-            sha256 = "f973aefa29d4191aad76cd1ba74ee3be4d2161b6c95d73c137f82560983912c6",
+            commit = "a5477045acaa34586420942098f5fecd3570f577",
+            sha256 = "0d6af8c8c00b3d733721f8d890ef43dd40f537c2e815b529085c1a6c30a21084",
         )