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What:
Fix a nasty issue with testing getting a config value with up to date tomlkit 0.7.2
Why:
The config_dict is some tomlkit extended dict class. With some tomlkit
0.7.1 or 0.7.2 a single test broke. At some place some of this dict
classes might return a proxy to a class and in the next iteration this
proxy doesn't work anymore because something is freed internally.
Therefore always copy the object to not free the data.
How:
Checklist: