tests: replace deepdiff with builtin comparisons

[radoering]

Motivation/Trigger

deepdiff does not allow cachebox 6 (cf qlustered/deepdiff#601) and cachebox 5 does not provide Python 3.15 wheels

Reasoning

We only use a very small portion of deepdiff's features, mostly ignore_order. Apart from that deepdiff may provide slightly better error messages in case of failures but that alone does not seem to be worth an additional (dev) dependency (+ 2 transitive ones).

Regarding ignore_order:

• We do not need it when comparing dicts.
• In some cases the order of lists was not fix in the past but is now.
• The only remaining case where order is not fix, can be handled with sorted().

[sourcery-ai]

Hey - I've reviewed your changes and they look great!

Sourcery assessment

Approved.

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