build(deps): bump protobuf from 3.20.2 to 3.20.3

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 3.20.2 to 3.20.3.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](https://github.com/protocolbuffers/protobuf/compare/v3.20.2...v3.20.3)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -51,7 +51,7 @@ pbr==5.10.0
 praw==7.6.0
 prawcore==2.3.0
 proto-plus==1.22.1
-protobuf==3.20.2
+protobuf==3.20.3
 pyasn1==0.4.8
 pyasn1-modules==0.2.8
 pycryptodome==3.15.0