[HIVE-26291] fix fd leak in ranger rest client

[adrian-wang]

What changes were proposed in this pull request?

fix fd leak when read ranger policy from json file

Why are the changes needed?

fd should be closed when done using.

Does this PR introduce any user-facing change?

No.

How was this patch tested?

N/A.

[adrian-wang]

@kgyrtkirk Could you please re-trigger the tests?

[github-actions[bot]]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Feel free to reach out on the [email protected] list if the patch is in need of reviews.