Bump rupicola from 1c6bef7 to 6d4f40c

Bumps [rupicola](https://github.com/mit-plv/rupicola) from `1c6bef7` to `6d4f40c`.
- [Release notes](https://github.com/mit-plv/rupicola/releases)
- [Commits](mit-plv/rupicola@1c6bef7...6d4f40c)

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

Signed-off-by: dependabot[bot] <[email protected]>