Bump protobuf from 3.19.4 to 3.19.5 in /docker/training

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](protocolbuffers/protobuf@v3.19.4...v3.19.5)

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

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

Author: dependabot[bot]

docker/training/requirements.txt

@@ -58,7 +58,7 @@ pathtools==0.1.2
 Pillow==9.2.0
 pkgutil_resolve_name==1.3.10
 promise==2.3
-protobuf==3.19.4
+protobuf==3.19.5
 psutil==5.9.1
 pudb==2019.2
 pyarrow==9.0.0