Update dependency jsonpickle to v4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
jsonpickle	3.4.2 -> 4.0.1

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Release Notes

jsonpickle/jsonpickle (jsonpickle)

v4.0.1

Compare Source

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* The unpickler is now more resilient to malformed "py/reduce", "py/set",
"py/tuple", "py/b64", "py/b85", and "py/iterator" input data. (+544) (+545)
* The test suite was updated to leverage more pytest features.
* The jsonpickle.compat module is no longer used. It is still provided
for backwards compatibility but it may be removed in a future version.

v4.0.0

Compare Source

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* Breaking Change: Python 3.7 is no longer supported.
* Breaking Change: Support for pre-0.7.0 repr-serialized objects is no
longer enabled by default. The safe option to decode() was changed from
False to True. Users can still pass safe=False to decode() in order
to enable this feature for the purposes of loading older files, but beware that
this feature relies on unsafe behavior through its use of eval(). Users are
encouraged to re-pickle old data in order to migrate away from the the unsafe loading
feature. (+514)
* The pickler no longer produces py/repr tags when pickling modules.
py/mod is used instead, as it is clearer and uses one less byte. (+514)
* The test suite no longer uses the deprecated datetime.datetime.utcnow()
function. (+539)

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[coveralls]

coverage: 44.421%. remained the same
when pulling a189cd4 on renovate/jsonpickle-4.x
into eceefb3 on development.

[renovate]

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