RFR: 8305814: Update Xalan Java to 2.7.3 [v2]

[Lance Andersen]

On Tue, 7 Nov 2023 05:43:06 GMT, Joe Wang <joehw at openjdk.org> wrote:

>> Xalan 2.7.3: merge minor changes from the upstream project.
>> 
>> Test: existing XML tests pass
>
> Joe Wang has updated the pull request incrementally with one additional commit since the last revision:
> 
>   remove commented out block in ExsltDatetime

Marked as reviewed by lancea (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/16532#pullrequestreview-1717450671