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GH-37864: [Java] Remove unnecessary throws from OrcReader (#37913)

### Rationale for this change
Make OrcReader more friendly to use with try-with-resources blocks and AutoCloseables by
removing an unnecessary throws modifier on close().

### What changes are included in this PR?
Removes an unused throws specifier on OrcReader#close().

### Are these changes tested?
Yes.

### Are there any user-facing changes?
No.
* Closes: #37864

Authored-by: James Duong <duong.james@gmail.com>
Signed-off-by: David Li <li.davidm96@gmail.com>