IPykernel >= 7.0.0 ContextVar values are not preserved between cells

If a value is assigned to a contextvar, it will not be preserved when moving to another cell in the notebook.
See this short example:

# cell 1
from contextvars import ContextVar

bro = ContextVar("bro", default="thisismydefaultvalue")
bro.get()
>> 'thisismydefaultvalue'

# cell 2
bro.set("!!!!!!!!!!!MODIFIED!!!!!!!")
bro.get()
>> '!!!!!!!!!!!MODIFIED!!!!!!!'

# cell 3
bro.get()
>> 'thisismydefaultvalue'

I've verified that this issue does not occur for ipykernel<7.0.0

SHould be fixed by #1462

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