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](https://github.com/protocolbuffers/protobuf/compare/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

@@ -15,5 +15,5 @@ PyPDF2==3.0.1
 youtube_transcript_api==0.5.0
 sentencepiece==0.1.97
 sentence-transformers==2.2.2
-protobuf==3.20.0
+protobuf==3.20.2
 python-pptx==0.6.21