Update protobuf requirement from <5.0.0dev,>=3.20.0 to >=3.20.0,<6.0.0

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@v3.20.0...v5.26.0-rc1)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 aiohttp>=3.8.0
-protobuf>=3.20.0, < 5.0.0dev
+protobuf>= 3.20.0, < 6.0.0
 oauth2-client==1.4.2
 websocket-client~=1.7.0
 PyYAML>=6.0