chore(deps): update protobuf to v36

Author: renovate-bot

MODULE.bazel

@@ -29,7 +29,7 @@ bazel_dep(name = "abseil-cpp", version = "20250814.2")
 # The name "com_google_protobuf" is internally used by @bazel_tools,
 # a native repository we cannot override.
 # See https://github.com/googleapis/google-cloud-cpp/issues/15393
-bazel_dep(name = "protobuf", version = "35.1", repo_name = "com_google_protobuf")
+bazel_dep(name = "protobuf", version = "36.0-rc2", repo_name = "com_google_protobuf")
 bazel_dep(name = "boringssl", version = "0.20251124.0")
 bazel_dep(name = "nlohmann_json", version = "3.12.0.bcr.1")
 bazel_dep(name = "curl", version = "8.8.0.bcr.3")

bazel/workspace0.bzl

@@ -171,10 +171,10 @@ def gl_cpp_workspace0(name = None):
         http_archive,
         name = "com_google_protobuf",
         urls = [
-            "https://github.com/protocolbuffers/protobuf/archive/v31.1.tar.gz",
+            "https://github.com/protocolbuffers/protobuf/archive/v36.0-rc2.tar.gz",
         ],
-        sha256 = "c3a0a9ece8932e31c3b736e2db18b1c42e7070cd9b881388b26d01aa71e24ca2",
-        strip_prefix = "protobuf-31.1",
+        sha256 = "46f5c52302d4af9b4a02c0f7d495167c72b0225b99b2ac3938f857f2f51435c5",
+        strip_prefix = "protobuf-36.0-rc2",
     )
 
     # Load BoringSSL. This could be automatically loaded by gRPC. But as of

ci/cloudbuild/dockerfiles/demo-debian-bookworm.Dockerfile

@@ -76,7 +76,7 @@ RUN curl -fsSL https://github.com/abseil/abseil-cpp/archive/20250814.2.tar.gz |
 
 # ```bash
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0-rc2.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \

ci/cloudbuild/dockerfiles/demo-debian-bullseye.Dockerfile

@@ -68,7 +68,7 @@ RUN apt-get update && \
 
 # ```bash
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0-rc2.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \

ci/cloudbuild/dockerfiles/demo-fedora.Dockerfile

@@ -66,7 +66,7 @@ ENV PKG_CONFIG_PATH=/usr/local/share/pkgconfig:/usr/lib64/pkgconfig:/usr/local/l
 
 # ```bash
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0-rc2.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Release \

ci/cloudbuild/dockerfiles/demo-opensuse-leap.Dockerfile

@@ -75,7 +75,7 @@ RUN curl -fsSL https://github.com/abseil/abseil-cpp/archive/20250814.2.tar.gz |
 
 # ```bash
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0-rc2.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \

ci/cloudbuild/dockerfiles/demo-rockylinux-9.Dockerfile

@@ -93,7 +93,7 @@ RUN curl -fsSL https://github.com/abseil/abseil-cpp/archive/20250814.2.tar.gz |
 
 # ```bash
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0-rc2.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \

ci/cloudbuild/dockerfiles/demo-ubuntu-24.04.Dockerfile

@@ -78,7 +78,7 @@ RUN curl -fsSL https://github.com/abseil/abseil-cpp/archive/20250814.2.tar.gz |
 
 # ```bash
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0-rc2.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \

ci/cloudbuild/dockerfiles/demo-ubuntu-jammy.Dockerfile

@@ -52,7 +52,7 @@ RUN curl -fsSL https://github.com/abseil/abseil-cpp/archive/20250814.2.tar.gz |
 
 # ```bash
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0-rc2.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Debug \

ci/cloudbuild/dockerfiles/fedora-cmake-quickstart.Dockerfile

@@ -129,7 +129,7 @@ RUN curl -fsSL https://github.com/nlohmann/json/archive/v3.11.3.tar.gz | \
     ldconfig && cd /var/tmp && rm -fr build
 
 WORKDIR /var/tmp/build/protobuf
-RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v33.6.tar.gz | \
+RUN curl -fsSL https://github.com/protocolbuffers/protobuf/archive/v36.0-rc2.tar.gz | \
     tar -xzf - --strip-components=1 && \
     cmake \
         -DCMAKE_BUILD_TYPE=Release \