Bump protobuf from 3.5.2.post1 to 3.18.3

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 3.5.2.post1 to 3.18.3.
- [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/commits/v3.18.3)

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

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

Author: dependabot[bot]

requirements.txt

@@ -114,7 +114,7 @@ msrestazure==0.4.27
 oauthlib==2.0.7
 passlib==1.7.1
 permission==0.4.1
-protobuf==3.5.2.post1
+protobuf==3.18.3
 pycparser==2.18
 PyJWT==1.6.1
 python-dateutil==2.7.2