build(deps): Update protobuf requirement

Updates the requirements on [protobuf](https://github.com/protocolbuffers/protobuf) to permit the latest version.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/protobuf_release.bzl)
- [Commits](protocolbuffers/protobuf@v4.22.0-rc1...v5.27.3)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

pyproject.toml

@@ -28,7 +28,7 @@ dependencies = [
   "aiohttp>=3.9.5,<3.11",
   "cryptography>=42.0.4,<44",
   "grpcio<1.54,>=1.53.2",
-  "protobuf<4.22,>=4.21.12",
+  "protobuf>=4.21.12,<5.28",
   "pydantic<3,>=2.6",
   "pydantic-settings<3,>=2.3",
   "pyopenssl<25,>=24.1",