ARROW-9129: [Python][JPype] Remove JPype version check

[kou]

Because we only run the test with the latest JPype.

Error details:

https://github.com/ursa-labs/crossbow/runs/769433714#step:6:7995

>       if jpype.__version_info__ >= (0, 7):
E       TypeError: '>=' not supported between instances of 'list' and 'tuple'

[kou]

@github-actions crossbow submit test-conda-python-3.8-jpype

[github-actions]

Revision: 4fd9f16

Submitted crossbow builds: ursa-labs/crossbow @ actions-319

Task	Status
test-conda-python-3.8-jpype

[github-actions]

https://issues.apache.org/jira/browse/ARROW-9129

[kou]

+1

The error has gone but new errors are appeared:

https://github.com/ursa-labs/crossbow/runs/770616977?check_suite_focus=true#step:6:10042

>       return om.readValue(jvm_spec, pojo_Field)
E       pyarrow.tests.test_jvm.com.fasterxml.jackson.databind.exc.MismatchedInputException: com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot deserialize instance of `java.util.ArrayList` out of START_OBJECT token
E        at [Source: (String)"{"name": "field_name", "nullable": true, "type": {"name": "timestamp", "unit": "NANOSECOND", "timezone": "Europe/Paris"}, "children": [], "metadata": {"field meta": "field data"}}"; line: 1, column: 151] (through reference chain: org.apache.arrow.vector.types.pojo.Field["metadata"])

The new errors are out of scope of this pull request.

[kou]

@xhochy Could you take a look the #7433 (comment) error?