RFR: 8260246: Ensemble: Update version of Lucene to 7.7.3

[Ajit Ghaisas]

On Wed, 27 Jan 2021 13:13:13 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

> This updates to the latest bug fix version of Lucene 7, which is version 7.7.3. Since it is only an update to the micro version, there is no need to regenerate the index. See [UPDATING-lucene.txt](https://github.com/openjdk/jfx/blob/master/apps/samples/Ensemble8/UPDATING-lucene.txt).

Marked as reviewed by aghaisas (Reviewer).

I applied the patch and tested on macOS 10.15.7.

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PR: https://git.openjdk.java.net/jfx/pull/387