Benjamin Drung 5fc7e15f96 Fix type annotation for resource_type
mypy complains:

```
ubuntutools/lp/lpapicache.py:143: error: Incompatible types in assignment (expression has type "None", variable has type "str")  [assignment]
ubuntutools/lp/lpapicache.py:1328: error: Incompatible types in assignment (expression has type "tuple[str, str]", base class "BaseWrapper" defined the type as "str")  [assignment]
```
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