[jfx11u] RFR: 8276142: Update gradle to version 7.3

[Kevin Rushforth]

Clean backport to `jfx11u`.

-------------

Commit messages:
 - 8276142: Update gradle to version 7.3

Changes: https://git.openjdk.java.net/jfx11u/pull/96/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx11u&pr=96&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8276142
  Stats: 227 lines in 7 files changed: 102 ins; 49 del; 76 mod
  Patch: https://git.openjdk.java.net/jfx11u/pull/96.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx11u pull/96/head:pull/96

PR: https://git.openjdk.java.net/jfx11u/pull/96