Benjamin Drung f0326592bd add type annotation for mypy
mypy comlains:

```
ubuntutools/config.py:53: error: Need type annotation for "config" (hint: "config: dict[<type>, <type>] = ...")  [var-annotated]
ubuntutools/lp/lpapicache.py:1504: error: Need type annotation for "_source_sets" (hint: "_source_sets: dict[<type>, <type>] = ...")  [var-annotated]
```
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