Bump simpleslackapi from 1.2.0 to 1.3.0
Bump simpleslackapi from 1.2.0 to 1.3.0

Bumps [simpleslackapi](https://github.com/Ullink/simple-slack-api) from 1.2.0 to 1.3.0.
- [Release notes](https://github.com/Ullink/simple-slack-api/releases)
- [Commits](https://github.com/Ullink/simple-slack-api/commits)

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