Bump pascalgn/automerge-action from v0.12.0 to v0.13.0
Bump pascalgn/automerge-action from v0.12.0 to v0.13.0

Bumps [pascalgn/automerge-action](https://github.com/pascalgn/automerge-action) from v0.12.0 to v0.13.0.
- [Release notes](https://github.com/pascalgn/automerge-action/releases)
- [Commits](https://github.com/pascalgn/automerge-action/compare/v0.12.0...c6f2699cc4c19ea7ce7f560dbebd85565b744377)

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