Upgrade to proto X.21.9 in various languages.

PiperOrigin-RevId: 488572991
Change-Id: I92d932a8f231c99126955092afe88f7b4153b963

Author: tholenst

tink_java_deps.bzl

@@ -64,12 +64,12 @@ def tink_java_deps():
     #   * @com_google_protobuf//:java_toolchain
     # This statement defines the @com_google_protobuf repo.
     if not native.existing_rule("com_google_protobuf"):
-        # Release from 2022-09-29.
+        # Release X.21.9 from 2022-10-26.
         http_archive(
             name = "com_google_protobuf",
-            strip_prefix = "protobuf-3.20.3",
-            urls = ["https://github.com/protocolbuffers/protobuf/archive/v3.20.3.zip"],
-            sha256 = "04e1ed9664d1325b43723b6a62a4a41bf6b2b90ac72b5daee288365aad0ea47d",
+            strip_prefix = "protobuf-21.9",
+            urls = ["https://github.com/protocolbuffers/protobuf/archive/refs/tags/v21.9.zip"],
+            sha256 = "5babb8571f1cceafe0c18e13ddb3be556e87e12ceea3463d6b0d0064e6cc1ac3",
         )
 
     # -------------------------------------------------------------------------