deps: upgrade protobuf to 4.33.0

Author: blakeli0

.cloudbuild/library_generation/library_generation.Dockerfile

@@ -37,7 +37,7 @@ RUN cp "/root/.m2/repository/com/google/api/gapic-generator-java/${DOCKER_GAPIC_
 FROM docker.io/library/python:3.13.2-slim@sha256:6b3223eb4d93718828223966ad316909c39813dee3ee9395204940500792b740 as final
 
 ARG OWLBOT_CLI_COMMITTISH=3a68a9c0de318784b3aefadcc502a6521b3f1bc5
-ARG PROTOC_VERSION=25.8
+ARG PROTOC_VERSION=33.0
 ARG GRPC_VERSION=1.76.1
 ENV HOME=/home
 ENV OS_ARCHITECTURE="linux-x86_64"

.cloudbuild/library_generation/library_generation_airlock.Dockerfile

@@ -38,7 +38,7 @@ RUN cp "/root/.m2/repository/com/google/api/gapic-generator-java/${DOCKER_GAPIC_
 FROM us-docker.pkg.dev/artifact-foundry-prod/docker-3p-trusted/python@sha256:afc139a0a640942491ec481ad8dda10f2c5b753f5c969393b12480155fe15a63 as final
 
 ARG OWLBOT_CLI_COMMITTISH=3a68a9c0de318784b3aefadcc502a6521b3f1bc5
-ARG PROTOC_VERSION=25.8
+ARG PROTOC_VERSION=33.0
 ARG GRPC_VERSION=1.76.1
 ENV HOME=/home
 ENV OS_ARCHITECTURE="linux-x86_64"

gapic-generator-java-pom-parent/pom.xml

@@ -32,7 +32,7 @@
     <google.http-client.version>2.0.2</google.http-client.version>
     <gson.version>2.12.1</gson.version>
     <guava.version>33.5.0-jre</guava.version>
-    <protobuf.version>3.25.8</protobuf.version>
+    <protobuf.version>4.33.0</protobuf.version>
     <opentelemetry.version>1.52.0</opentelemetry.version>
     <errorprone.version>2.42.0</errorprone.version>
     <j2objc-annotations.version>3.1</j2objc-annotations.version>