Fix encoding Incorrect padding error

[kt474]

Summary

Need to wait for server side changes to fully test. I'm still a bit confused about this bug -

if isinstance(obj, np.ndarray):
    if obj.dtype == object: # obj.dtype for the ndarray causing the bug is float64
        ...
    elif obj.ndim: # this value is 1? Do we need to check for obj.size instead
        ...

Update: there was an issue with metadata serialization on the server side which is also being patched. Also updating the decoder on the client side here

Details and comments

Fixes #

[coveralls]

Pull Request Test Coverage Report for Build 9163053346

Details

• 3 of 4 (75.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.007%) to 82.74%

---

Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
qiskit_ibm_runtime/utils/json.py	3	4	75.0%

Totals
Change from base Build 9162910154:	-0.007%
Covered Lines:	6232
Relevant Lines:	7532

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💛 - Coveralls