[jfx21u] RFR: 8376299: [jfx21u] backported test requires more recent JDK

[Jose Pereda]

This PR removes the AutoCloseable feature from a test, as it is not supported by the min build and target JDK 17 that is set for JavaFX 21u.

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Commit messages:
 - Remove AutoCloseable feature from test

Changes: https://git.openjdk.org/jfx21u/pull/111/files
  Webrev: https://webrevs.openjdk.org/?repo=jfx21u&pr=111&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8376299
  Stats: 5 lines in 1 file changed: 3 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jfx21u/pull/111.diff
  Fetch: git fetch https://git.openjdk.org/jfx21u.git pull/111/head:pull/111

PR: https://git.openjdk.org/jfx21u/pull/111