chore(deps): update dependency com_google_protobuf to v29.3

Author: renovate[bot]

tests/WORKSPACE

@@ -273,9 +273,9 @@ http_archive(
 
 http_archive(
     name = "com_google_protobuf",
-    sha256 = "60c1ab4befe9d0a975c2344b5511bf6b44f91ec3e1426c878f56bf30a0589c43",
-    strip_prefix = "protobuf-29.2",
-    urls = ["https://github.com/protocolbuffers/protobuf/releases/download/v29.2/protobuf-29.2.zip"],
+    sha256 = "e9b9ac1910b1041065839850603caf36e29d3d3d230ddf52bd13778dd31b9046",
+    strip_prefix = "protobuf-29.3",
+    urls = ["https://github.com/protocolbuffers/protobuf/releases/download/v29.3/protobuf-29.3.zip"],
 )
 
 load("@com_google_protobuf//:protobuf_deps.bzl", "protobuf_deps")