chore(deps): update all dependencies (#2252)

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: renovate-bot

packages/gapic-generator/Dockerfile

@@ -1,4 +1,4 @@
-FROM python:3.12-slim
+FROM python:3.13-slim
 
 # Install system packages.
 RUN apt-get update \

packages/gapic-generator/WORKSPACE

@@ -73,9 +73,9 @@ http_archive(
 # instantiated in grpc_deps().
 http_archive(
     name = "com_google_protobuf",
-    sha256 = "b2340aa47faf7ef10a0328190319d3f3bee1b24f426d4ce8f4253b6f27ce16db",
-    strip_prefix = "protobuf-28.2",
-    urls = ["https://github.com/protocolbuffers/protobuf/archive/v28.2.tar.gz"],
+    sha256 = "7c3ebd7aaedd86fa5dc479a0fda803f602caaf78d8aff7ce83b89e1b8ae7442a",
+    strip_prefix = "protobuf-28.3",
+    urls = ["https://github.com/protocolbuffers/protobuf/archive/v28.3.tar.gz"],
 )
 load("@com_github_grpc_grpc//bazel:grpc_deps.bzl", "grpc_deps")