Bump akka.version from 2.3.12 to 2.5.31 in /akka
Bump akka.version from 2.3.12 to 2.5.31 in /akka

Bumps `akka.version` from 2.3.12 to 2.5.31.

Updates `akka-actor_2.11` from 2.3.12 to 2.5.31
- [Release notes](https://github.com/akka/akka/releases)
- [Commits](https://github.com/akka/akka/compare/v2.3.12...v2.5.31)

Updates `akka-testkit_2.11` from 2.3.12 to 2.5.31
- [Release notes](https://github.com/akka/akka/releases)
- [Commits](https://github.com/akka/akka/compare/v2.3.12...v2.5.31)

Updates `akka-remote_2.11` from 2.3.12 to 2.5.31
- [Release notes](https://github.com/akka/akka/releases)
- [Commits](https://github.com/akka/akka/compare/v2.3.12...v2.5.31)

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