Bump protobuf from 3.15.0 to 3.18.3

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 3.15.0 to 3.18.3.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](https://github.com/protocolbuffers/protobuf/compare/v3.15.0...v3.18.3)

---
updated-dependencies:
- dependency-name: protobuf
  dependency-type: indirect
...

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

poetry.lock

@@ -2190,37 +2190,35 @@ wcwidth = "*"
 
 [[package]]
 name = "protobuf"
-version = "3.15.0"
+version = "3.18.3"
 description = "Protocol Buffers"
 category = "main"
 optional = false
-python-versions = "*"
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 ]
 
-[package.dependencies]
-six = ">=1.9"
-
 [[package]]
 name = "psutil"
 version = "5.7.2"