Bump protobuf from 3.11.3 to 3.18.3

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 3.11.3 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@v3.11.3...v3.18.3)

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

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

requirements.txt

@@ -82,7 +82,7 @@ pexpect==4.2.1
 Pillow==8.1.1
 pkginfo==1.5.0.1
 pluggy==0.13.1
-protobuf==3.11.3
+protobuf==3.18.3
 psycopg2==2.8.4
 py==1.10.0
 py3plex==0.69