Bump externals/marl from `2f129cf` to `a47a3a5` (#604)
Bump externals/marl from `2f129cf` to `a47a3a5` (#604)

Bumps [externals/marl](https://github.com/google/marl) from `2f129cf` to `a47a3a5`.
- [Release notes](https://github.com/google/marl/releases)
- [Commits](https://github.com/google/marl/compare/2f129cf1baa4fb8cd2fc848fdcb33cb6ae3566d1...a47a3a5c54435751d30e3154fdf17e3b29fc6796)

---
updated-dependencies:
- dependency-name: externals/marl
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
Co-authored-by: dependabot[bot] <1c358da00a777d4e9898c1280ab801e2df165188@users.noreply.github.com>
WNProject/WNFramework,WNProject/WNFramework,WNProject/WNFramework,WNProject/WNFramework