Renode expects a specific version or it keeps warning about. Fixes:
,----
| Required `robotframework` version is `6.0.2`, while the one available in
| your system is `7.0.0`. Tests may still work, but this version of Robot
| is not officially supported. Please install the required version using
| `pip install robotframework==6.0.2` before running the tests
`----
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
We can now use standard nix-update-script but the renode-unstable still
requires the custom update script so we moved it to the specific .nix
file.
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>
