Bump protobuf from 3.20.0 to 3.20.2

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 3.20.0 to 3.20.2.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/main/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.20.0...v3.20.2)

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

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

requirements.txt

@@ -2,4 +2,4 @@ pymatgen==2022.9.8
 tensorflow==2.9.0
 ase==3.22.1
 cython==0.29.32
-protobuf==3.20.0
+protobuf==3.20.2