Bump protobuf in /examples/research_projects/decision_transformer (#19176)

Bumps [protobuf](https://github.com/protocolbuffers/protobuf) from 3.19.4 to 3.19.5.
- [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/v3.19.4...v3.19.5)

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

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

examples/research_projects/decision_transformer/requirements.txt

@@ -144,7 +144,7 @@ portalocker==2.0.0
 poyo==0.5.0
 prettytable==3.2.0
 prompt-toolkit==3.0.28
-protobuf==3.19.4
+protobuf==3.19.5
 psutil==5.9.0
 ptyprocess==0.7.0
 pure-eval==0.2.2