Investigate why Dependabot does not update some dependencies

[Lun4m]

Dependabot seems to skip updating some dependencies, for example:

• tonic is stuck on 0.7.2, while the latest is 0.12.3
• prost is stuck on 0.10.4 while the latest is 0.13.4

[intarga]

From discussion in this thread, seems to be buggy behaviour with dependabot, we've decided to either try renovatebot or write our own automation