Bump rupicola from 73addd2 to d4a6c84 (mit-plv#1858)

Bumps [rupicola](https://github.com/mit-plv/rupicola) from `73addd2` to `d4a6c84`.
- [Release notes](https://github.com/mit-plv/rupicola/releases)
- [Commits](mit-plv/rupicola@73addd2...d4a6c84)

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

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