[jfx17u] RFR: 8276142: Update gradle to version 7.3

[Kevin Rushforth]

Clean backport to `jfx17u`.

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Commit messages:
 - 8276142: Update gradle to version 7.3

Changes: https://git.openjdk.java.net/jfx17u/pull/56/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jfx17u&pr=56&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/jfx17u/pull/56.diff
  Fetch: git fetch https://git.openjdk.java.net/jfx17u pull/56/head:pull/56

PR: https://git.openjdk.java.net/jfx17u/pull/56