Bump protobuf from 3.13.0 to 3.18.3

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 3.13.0 to 3.18.3.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.13.0...v3.18.3)

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

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

Author: dependabot[bot]

test-requirements.txt

@@ -20,7 +20,7 @@ jsonschema==3.2.0
 packaging==21.0
 paramiko==2.10.1
 pluggy==0.13.1
-protobuf==3.13.0
+protobuf==3.18.3
 py==1.10.0
 pycparser==2.20
 PyNaCl==1.4.0