Update dependency com_google_protobuf to v31

Author: renovate[bot]

e2e/smoke/WORKSPACE.bazel

@@ -8,9 +8,9 @@ load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 
 http_archive(
     name = "com_google_protobuf",
-    sha256 = "10a0d58f39a1a909e95e00e8ba0b5b1dc64d02997f741151953a2b3659f6e78c",
-    strip_prefix = "protobuf-29.0",
-    url = "https://github.com/protocolbuffers/protobuf/releases/download/v29.0/protobuf-29.0.tar.gz",
+    sha256 = "12bfd76d27b9ac3d65c00966901609e020481b9474ef75c7ff4601ac06fa0b82",
+    strip_prefix = "protobuf-31.1",
+    url = "https://github.com/protocolbuffers/protobuf/releases/download/v31.1/protobuf-31.1.tar.gz",
 )
 
 load("@com_google_protobuf//bazel/private:proto_bazel_features.bzl", "proto_bazel_features")  # buildifier: disable=bzl-visibility