Multimod shouldn't upgrade to package versions that don't exist

[dmathieu]

This release of otel-go was done using multimod to upgrade the package versions.

One of the packages, sdk/log/logtest is in the excluded modules. So it doesn't have any releases.
Yet, multimod still upgraded it, which was unseen within the repository because of the replace statements.
See open-telemetry/opentelemetry-go#6800

Multimod shouldn't try to upgrade packages to versions that don't exist.
This issue is maybe due to the fact that sdk/log is a published package?

[dmathieu]

I wonder if this was because the package was a brand new one (the module used to be part of the parent package). I can't seem to reproduce the issue anymore.

[pellared]

Probably you could try reproducing it be create a new module 😅